Seems that there are some new rumors on the new xbox.
First off, MS will let publishers decide whether their content should have an always-on connection or not.
The friends system will have no cap anymore.
They want to make it similar to twitter, where people can follow one another.
More achievements.
Let developers add achievements later in game.
XBLive more intergrated into social media.
XBLive is going to be better aligned with social media like Facebook/Twitter.
As always with rumors, take it with a heap of salt.
Source: 360Crunch