Just uploaded 2.7 and I love it! back-end looks awesome. I am using the QuickPress feature right now. Looks great! I will give my full review later.

I have been playing with 2.7 for a little bit now, I have not read the release notes yet but so far so good.  First thing most everyone will notice is the admin panel.  The design of the back/admin panel is great, very refreshing.  Drop down menus that are js, give a very smooth feel to using the navigation.  Plugins seems a bit different is shows you recently activated that have been deactivated. 

For the couple of ours I have used it, I have no complaints, and I would suggest this upgrade to everyone.  

Image adding is nice, you can click on the image when your posting and resize it with % 

Wordpress.org really did a great job!