I too think it is going to be more streamlined (faster) looking. IMO, it is going to take the sleek look of the X3 (don't get me wrong - I prefer the E70 0ver the X3) and make it significantly better.

I think the new X5 is going to look sportier, which I like.

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2011 X5 Xdrive50i Sport Package AD
2013 Touareg TDI
2012 Ford F250 Super Duty Powerstroke
1997 BMW M3 Sedan
1995 BMW 540i 6 Speed

Retired:
2008 Acura MDX (good car - yawn)
2002 M5 (I will miss this car forever)
1999 M3 (fun car X2)
1992 325IS DINAN (fun car)
1987 325IS (fun car)
1986 325IS (fun car)