Hopefully, plasmas that are anomaly-free (e.g. no floating blacks, rising blacks or FBr) - hopefully from Panasonic since they seem to at least have the gall to acknowledge these problems in their products and strive to improve them. Deeper blacks, more accurate color. Cheaper 3D glasses (Panasonic is seriously lagging behind Samsung in regards to glasses pricing - Samsung's battery-powered specs are priced as low a $30/ea. now). Problem-free 96Hz mode.
Samsung: Better blacks, better Cinema Smooth mode, no fluctuating brightness, better build quality (which I highly doubt). I think their 2011 sets look great but their build quality this year especially seems pretty poor overall. generally that has always been my problem with Samsung - they make great products but they've never been great in regards to quality or support.
LG - Who cares?
I'm really hoping Panasonic pulls through in 2012. I don't think we'll get 9G Kuro blacks but hopefully they'll be better than the '11s. If their sets are good enough, and my budget permits, I think 2012 will be my year to upgrade. I only got my 50" G20 in early 2010 and I love it, but depending on the content the floating blacks get on my nerves, and at a distance of seven feet I feel like I could comfortably fit a 60", and I'd love to get into 3D. I even bought a Panny 310 BD player in anticipation of a future 3D upgrade.
I just hope the picture quality is there in 2012 - while I think Panny's 2011 sets look great, I didn't feel there was a great deal of improvement between them and my 2010 model, at least as much as I'd have hoped.