I love how it integrates a built-in binary diff tool. Version Control basically lets you watch a binary as it evolves over time. This can be used to check if bugs have been patched, to inspect new code for bugs (which are often less well-tested than existing code), and to try to work out what recent patches have fixed (so you can target older versions with new exploits). IDA doesn't ship with such a feature, and plugins which do implement it are kinda clunky, so I'm excited to see what the version control feature will bring.

I am also curious as to what was left out of the public release. It's clear that not everything was included (even though there's a lot here).