Haven't heard and desperate to find out if Lotso will be there again as he is DD8s favourite character and she was disappointed she wouldnt get to meet him in the parks - not saying anything to her until I find out the list for sure!
If you are not in line early you can wait 1 1/2 hours or more. My wife got in line at 5:30 and was second in line(they came out at 7). While she waited I took the kids on BTMR and SM multiple times(they were walk on). They came out promptly at 7 and we were in and out in 5-10 minutes. When we left the line was already back to the entrance of BTMR. My tip is wait before the party and not during it. When the party is only happening for 5 hours you don't want to spend 2 just to meet one character or set of characters. BTW it was just the seven dwarves, no Snow White. Just a very simple go up greet them pose and leave. They do have a photopass person there so that is nice.