This has a new protocol, but isn't worthy of being called 2.2 yet.
Linux has Debian 64-bit precompiled binaries, but you can compile your own as it also contains the source.
If you are using Mac or other operating systems, download the Linux package.
The server pack is ready for both Windows and Linux, but you might need to compile your own for linux (source included)
If you are using linux, you may wish, and it is desirable in this manner, to use -LS5 -LF2 to use the file log instead of the syslog. This will be fixed next release.