The current version (8.0) does support Visual Studio 2012. However seems like we haven't updated the "supported VS versions" field in time: will fix that right now, thanks for bringing this up to our notice.
Tomas, thanks for the question. The latest TeamCity (version 8.1) in fact does support VS2013. Please download the build from TeamCity web site (http://www.jetbrains.com/teamcity/whatsnew/) We'll update the build here on Visual Studio Gallery in a short while.