X7 is coming closer and closer, after the binary already arrived on the FTP last week:
now the release:
and also other docs:
like the x7 admin guide:
The software is still not listed on the Cisco site:
So possibly you have to be a bit patient till the release keys are available.
There are many interesting enhancements, like 200 sip domain limit, b2bua for Lync, ...
As always: Please read the release notes and admin guide carefully before upgrading!