This is from another (non Arduino) forum
They talked about changes to the IDE that it will make it easier to add other compilers and platforms to the IDE but I'm not sure what they meant as they didn't go into much detail.
I assume they mean the IDE can be modified to support chipKIT, netduino or other arduino style modules but don't know for sure.
They also mentioned that a version of DUE would have internet embedded in the module with a future release chip. Again not much detail.
They had the designer of the Atmel AVR talk but I fast forwarded through that as it appeared to be an Atmel commercial rather than an Arduino update. That took about half the time.
That's about 500% more that we've heard here or from any official source.
Good to see that the Arduino PR machine is working at full steam.
So according to that there is not a new IDE, just an upgraded IDE. =(
EDIT: Youtube video of the talk posted here
http://arduino.cc/forum/index.php/topic,113460.new.html#new
Rob