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Official unofficial 2006 Mercedes-Benz model line-up
So, to end all speculation, here is what I remember (I might have missed one, but i don't think so). It only listed the Eurodelivery models, but the other models aren't in question anyway, so I put the whole lineup down (except the G).
C230K Sedan (still 4 banger)
C280 Sedan (4matic optional w/ 5 speed, unclear on RWD if 5 or 7 speed auto)
C350 Sedan (4matic optional w/ 5 speed, or RWD with 6 speed manual or 7 speed auto)
C280 Wagon (4matic optional)
C350 Wagon (4matic optional)
E350 Sedan (4matic available)
E500 Sedan (4matic available)
E350 Wagon (4matic available)
E500 4Matic Wagon
S430 (4matic available)
S500 (4matic available)