The size of the engine and the number of cylinders matters less to me than how it feels when it is driven. I was quite happy with my 2003 V6 LS because the engine felt peppy when driven. I suspect a lot of Lincoln customers will feel the same way and won't care too much about what type of engine is in the MkS. That said, I will defer judgement on the car until I drive it.
I agree with the above posts about Ford always being a step or two behind the competition in technology, and not only on drivetrains, but on little stuff. One example is Auto Up/Down window switches. IIRC, in the 2000 LS, an auto down switch was available for the driver's side window only (no auto up). Yet at the same time, the competition (BMW, Lexus) had Auto up AND down switches on at least both front windows, and perhaps even all four windows. My 1993 Infiniti G20 had the same auto down driver's window as the 2000 LS! In 2003, Lincoln finally added auto up/down to the two front windows, but not the rears. Our 2006 Lexus IS20 has auto up/down on all four windows.
Another example is Bluetooth technology. Its simply not available in any Lincoln (except as a dealer-installed option), yet for the last couple years, much of the competition includes it as standard equipment.