The 2008's have barely been out more than 2 moths. I would not hold my breath waiting for info on the 2009s for a while still. Aux in is rumored to be coming in the next gen, I don't know about 2009.
We should be seeing some information soon. I don't expect an AUX port unless they had the radio supplier design a unit with enough inputs for AM/FM/XM/OnStar/AUX, because at the moment that radio does not have enough.
I'd like to see navigation, sunroof, XM, and the panoramic windshield added. Oh, throw in a higher output engine...I'll buy.