Here is the build to upgrade your servers. Almost nothing really new, just fixes and several minor improvements mostly drived by your valuable feedback. See the report from the issue tracker for details.
The build uses the same data format as 6.5 and 6.5.1, so you can downgrade to 6.5.x if you need (but you hopefully do not).
BTW, if you have not yet checked recent update of JetBrains YouTrack to version 3.0, you might want to give it a try (free edition included). YouTrack team is also starting with YouTrack hosted offering, which definitely deserves a try if you need something lightweight yet powerful for your next project.
Like hosted YouTrack and want the same for TeamCity?
That's not something that we are already preparing while we do think about it.
We would really like to hear real-life stories why you need this and for what type of projects.