Fords will offer maximum economy and max.performance. Manual tranmissions will be avail. on all models, with all engines. Fusion/427 styling on all fwd models.
Lincoln will be powerful but specialize in luxury, not try to be sporty; super smooth adaptive automatics only, intelligent active suspension is std. Zephyr-concept styling on all fwd-awd models but with new crosshatch grille.
Mercury will have sophisticated styling, features, and mechanicals. Ex: paddle-shifting smg/dsg (optional) and adjustable suspensions (standard), so they could be sport, normal, or cushy as desired. Each Mercury model will have a wide price range to offer base to Lincoln-level features. Milan/Meta-One styling on all fwd-awd models and Marquis. The XR7 and 'M' share more adventurous styling.
Hybrids are engineered to increase both fuel economy and performance over "unassisted" IC engines. (also see mechanical differentiation )
Prices shown are for 2010MY.

FWD/AWD:

B CLASS   (name?, - , - )
Ford only - 3 & 5 door hatches, 5 door crossover. 4 cyl and hybrid. $11-18.5k
    (either Mazda2-based or shortened C1 like the Volvo C30)

C2   (Focus, name?, - ) (( C2 is to C1 as D2C is to Dew98 ))
F - 3 & 5 door hatches, 4 door sedan, 5 door wagon & crossover. 4 cyl and hybrid. $14.5-23k
M - 4 door sedan, 2 door coupe-cabrio. 5 cyls na/hybrid/supercharged/sc-hybrid. $19-35k
    Also a very small targa XUV(more offroad than a crossover) as a personal all-activity vehicle.
    (all Mercury sedans would be a 'dual-back', sedan look but full hatch plus small trunklid)
L - none

CD3   (Fusion, Milan, Zephyr or LZc/LZx)
F - 4 door sedan, 5 door crossover. 2.3L 4 cyl, 3.0L v6 and hybrid versions of both. $18-28k
M - 4 door sedan, 5 door stationwagon. 3.0L and 3.5L v6's, and hybrid versions of both. $22-37.5k
    (stationwagon=sleek crossover using the sedan's styling. opt? wood-look side molding, not panels)
L - 2 door coupe, coupe-cabrio, & 5-door-XUV. (3.5L v6 coupe only), 3.8L v6, & 4.4L Yamaha v8. $(30)-48k
    (v8 is awd only)

D CLASS   (500, Montego, TownCoupe or LTc)
These cars need a shorter overall length. Hopefully that will happen when the D+ comes out.
F - 4 door sedan, 5 door crossover. 3.0L and 3.5L v6 and 3.0-hybrid. $21.5-32k
    (possibly SVT500 with a forced induction 3.8 v6 or a 4.4 Yamaha v8 $?)
M - 4 door sedan, 5 door stationwagon. 3.5L v6, 3.0L and 3.5L hybrids. $25-40k
L - 2 door coupe, coupe-cabrio. 3.8L v6 and 4.4L Yamaha v8. $39-54k
    (these TownCoupes shares styling and as much sheetmetal as possible with the TownSedan,
     v8 is awd only)

D+   (500Fairlane, - , TownSedan or LTs/LTx) (longer wheelbase D class with larger engine compartment)
F - 4 door sedan, 5 door crossover. 3.5L v6, 3.5-hybrid, 4.6L v8. $25-37k
    (v8 is awd only)
M - none (see RWD P1 platform)
L - 4 door, 5-door-XUV. 3.8L v6, 4.6L v8, and 4.4L Yamaha v8. $44-54k
    (v8's are awd only)

( Sept 2005   'family tree' of FML's midsizers )


RWD (performance series):

small (shortened D2C or modified RX8)
F - GR2 supercar. v10 or v12. $100k
M - none
L - 2 door coupe-cabrio only. supercharged 3.8L v6, a v8(4.6 or 4.4), maybe a detuned v10-v12. $50-66k
    (engine is only option - each engine would have its own unique hood) (plain coupe may be added later)

D2C - Mustang only - 2 door coupe, convertible. 3.5L v6, 4.6L and 5.4L v8's. $20-60k

D2C+
F - Falcon - 2+2door sportsedan & fastback-hatch. 3.5L v6, 4.6L v8 (and 5.4L?). $20-35-(?)
    (a stretched Mustang with 3 bar grille, no "C" scoops;
     2+2door='suicide' rear doors, also used for Thunderbird & of course, the Continental)
M - Cougar or just "XR7" - 2 door coupe(dual-back), coupe-cabrio. 3.5L v6, 5.0L v8. $24-44k
    (Mercury only - 5.0L v8, adapted from 4.6/5.4 - forced-induction version too)
L - none (Sentinel?)

All new efficient Body-on-Frame (smaller outside, bigger inside, & lighter) blend of D2C/SN197 & Panther.
Pzero (shortest "P"platform)
F - Thunderbird - 2+2door sport-lux-sedan. 3.8L v6, 4.6L & 5.4L v8's. $26-44k
M - "M"/XR8 - CLS-style 4 door 'coupe-sedan'. 3.5-hybrid v6, 5.0L v8, 5.0-hybrid v8. $29-48k
    -  forced-induction-5.0v8-only version with black-out trim as Marauder $37-47k
    (possibly the M could share styling though not sheetmetal with the XR7 for more brand identity)
L - Mark-X - 2 door coupe, coupe-cabrio. v8's only. $46-60+k

P1 (direct Panther successor - full-sized RWD platform)
F - "CV" as in Commercial Vehicle - no retail version, taxi/cop/fleet only. v6's and v8's
M - Marquis - 4 door sedan. 3.5-hybrid v6, 5.0L v8, 5.0-hybrid v8. $30-49k
L - none

P2 (moderately longer wheelbase - more interior room)
Lincoln only - Mark-X - 4 door sedan. v8's only. $50-60+k
    (all Marks have same sheetmetal except roof,doors,floorpan)

P3 (even longer wheelbase - extended engine compartment - interior size same as P2)
Lincoln only - Continental 2+2door flagship sedan. v10 or v12 (maybe Yamaha 4.4L v8). $60-70
   (Continental has suicide rear doors, unique hood, grille & trunklid
    but shares as much sheetmetal as possible with earlier-released Marks)

Mazda and Volvo don't seem to need any suggestions.

Land Rover would only be sold in partnership thru L-M, Volvo, or particularly AM-Jag dealerships (not sure if this is already the situation)

Jaguar may cease to exist as a separate company. English operations could be taken over by Aston Martin, who would build 1 sedan called simply 'Jaguar' (regular and long wheelbase versions) and 1 sportscar called XK2, in addition to the A-M supercars. The XK2 would serve as an 'entry' level for A-M (ie $50-80k).
At the same time, the Jaguar name could be brought over to Ford's under-utilized US factories, to build domestic-only Jaguars. Their new logo would be a silver jaguar on a green oval.
or...