The latest developer preview build in an early alpha of 2.0. It is noticeably less functional than the latest stable release, which is still built on Ubuntu.
If you want to play around with their package manager and distrobox, I'd suggest trying out the latter.
This has some good info.
https://news.itsfoss.com/vanilla-os-beta/
The main change with 2.0 is the Debian Sid base, as opposed to Ubuntu.