There are two major things that I'm looking forward to in Shift 2 unleashed.
1: They did a MAJOR overhaul on the AI. Shift 1's AI is hands down the worst out there IMO. Make a list of everything we console SIM racing fans hate about AI.., and you'll find it in Shift 1. Way too aggressive, rubber-band, sling-shotting, constant illegal blocking moves, they gang up on you, non stop brake checking. Just an absolute mess!
2: Night racing looks freaking AMAZING. Without even taking physics into consideration.., based on the vids.., night racing in Unleashed is going to destroy GT5 in this area. In Unleashed the headlights actually let you see the road!
For me the most annoying issue I had with Shift 1 was the AI. Even if the physics in Shift 2 unleashed are only slightly improved over Shift 1.., if the AI has been fixed.., that's all good with me baby!