I have been following what has been released so far and all the changes so far have been one of 3 changes.
1) Upgrading internal library Smarty, Zend and a few other library.
2) Devblocks Constructors no long require the instantof or ,1 any more. I have never seen it used so that makes since removing that.
3) The setting have been cleaned up. You now can setting the settings but just define a string for the identifier instead of being determined but the class it is in. The old method was so bad it many times was just easier to just define your own database and store your own settings there then to use it. Now the settings are some much easier to work with.
Thanks
Robert
PS. I have heard from someone that jquery is going in now although no code has been posted yet. I am so looking forward to this change. YUI needs to die.