Built-in schemamigration and refactored app loading in 1.7 are extremely exciting in my opinion.

South has worked well for us, but 1.7's built-in migration squashing/rebasing has me excited by itself. I have to run some really hackish custom stuff to do this on South right now.

The packages we typically use have shown a few rough edges when we took 1.7a1 for a test drive, so we submitted some pull requests and that was that.

It took us about an hour to get the site up on 1.7a1. This announcement came too late today to try 1.7a2 yet.