Since we moved to github in February, the community response so far has been very good. Today I merged pull request #77! Several nice community contributed features found their way into OTRS 3.3, such as multiple backends support for CustomerCompany.
Last week we moved all the remaining content to github too: the OTRS ITSM packages as well as other public extension packages such as FAQ and Survey. This makes it possible to include community contributions for these modules in a very convenient way via pull requests.