I am an Acura dealer and have had confirmation from our rep that the TSX re-design will be for the 2009 model year. AWD is definite and no confirmation on Turbo yet (not sure if that will only be on Type S or not). RSX will come back same time as TSX Coupe. I have also been told this release will happen earlier than Fall 08, and more along the lines of the original TSX release (Spring 08)
This will also coincide with the TL re-design (Fall 08) for 09 model year with AWD as definite and 3.5L and a mid-model re-design on the RL.
Current generation Acura TL
Speculations about SH-AWD being a feature for all Acuras have been around since the introduction of the Acura RDX and redesigned MDX. Front wheel drive only cars won't cut it competing in the luxury segment, so SH-AWD in all their cars make sense. Although, there is a good portion of the Acura population that would like to see a rear wheel drive option, this is unlikely to happen, at least in 2009.
Honda Sports 4 (rumored to be next gen TSX)
Not everyone is excited about a turbo TSX because of the poor gas mileage seen in the RDX (19 city - 24 highway). The RDX's fuel economy may be due to it's size and weight, a turbo sedan makes more sense. Still, only time will tell if the next TSX will see Acura's new force induction technology, maybe only on the TSX Type-S? There are some people out there who would like a small naturally aspired V6 instead of a turbo 4 cylinder.
Currently, there are no coupes in Acura's lineup ever since they dropped the NSX and RSX. A brand that pushes luxury performance vehicles, yet doesn't have a sports car to sell sounds kind of like an oxymoron. There also have been some rumors of how Honda is going to drop the Honda S2000 so that Acura can pick it up. Either way, Acura needs a coupe soon.
[Source of Rumors] Acurazine.com