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Ipr, Inspections, Duplicates runners
TeamCity provides enhanced dialog to setup builds which depend on IntelliJ IDEA's IPR project file. Unfortunately, it was impossible to convert old configuration to the new one, so after upgrade to this version of TeamCity you'll have to tweak your configuration manually.
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The default value for TeamCity data directory is $HOME/.BuildServer where $HOME points to user's home directory.
Duplicates runner - Web UI
From now, duplicates results are available in the Web UI. You can easily open file with duplicates in IDE, by clicking the link near file with duplicate.
Dependent builds and Ivy integration
TeamCity allows to depend one build configuration on another one in terms of artifacts. I.e. if one build configuration requires library produced by another build configuration, you can easily add such dependency and dependent library will be downloaded to the specified place right before build start.
Moreover, TeamCity artifacts repository acts as Ivy repository, so you can reference and use artifacts from TeamCity in your ant builds!