If they are going to take on Audi and BMW, they are going to need 2 things.
1) A bigger platform to compliment the legacy. (something that can accomodate a big flat six, possibly with turbo) so that legacy drivers will have somewhere to go up once they outgrow the legacy.
2) more power (as has been mentioned earlier) six or turbo four.
I'd love to see a turbo flat 6 putting out 350+ HP and the size of say an A6 or A8.
'97 Rodeo @ 129mph soon to be '00 Legacy GT Limited
'91 Escort Crap
Parents '97 Legacy L