This current gen I own all of the systems, i've never been a fanboy or anything - just played on what worked for me the best. This gen (again i own Wii, 360, and PS3) i played my 360 the most by a huge margin. Sure the multiplayer was a big aspect, but really the XMB was just the worst UI for me on the PS3. I hated the way they did updates and i just generally disliked the whole thing, i thought it was a mess in dealing with online too.
My question - Has Sony said anything about changes in the UI?
Besides the sharing and some online friends stuff I'm not sure i've heard much else from them. Because that is one thing that is really holding me back from just preordering one right now is the fear that i will just hate the system - (I've barely played my PS3 - huge bummer every time i think about it)
Side note - Sony's press conference last night was unreal. If they didn't get people who play games pumped up for new consoles... then nothing will.