Yeah he looks different, but keep in mind that he's just starting to meet his fans again. He spent the last 4 years without many public contacts. After everything that happenened for him, he needs to find his bearings again
He seems a bit shy, not sure on how to act with the audience... Proof is missing. Kon Artis is okay and i can't tell if Kuniva or Swifty McVay would do better. Maybe 50 Cent could be helpful in these occasions, as he doesn't have these confidence issues. However, it's cool to bring D12 on the shows, unity doesn't hurt. And 50 wouldn't be present all the time anyway.
I also think his clothes don't help, some loose-fitting clothes would smooth his moves, that seem a bit rough. The sweater on Lose Yourself/Insane helps a bit.
The audience is more enthusiastic on Crack a Bottle and he enjoys this, he looks more comfortable.
You can see his emotions at the end of Lose Yourself. He seems relieved that it went well

Edit: better video for Lose Yourself :
http://www.youtube.com/watch?v=HyN9BLu7Bwc