NHIbernate releases don't follow any pre-defined release cadence; the project is typically released when there are a sufficient number of additional bugs/features/issues completed/addressed to warrant a new release. As with most OSS, this doesn't represent a predictable time-frame, of course because the pace of contributions is neither predictable nor consistent from week-to-week and month-to-month.
Do note however that the tradition around this project has been that the trunk is nearly-always considered a 'stable' build, meaning that its generally a 'safe' action to checkout the source and compile it for yourself at intermediate points should you desire a more frequent update to NH for your own use/needs.
Steve Bohlen
sbo...@gmail.comhttp://blog.unhandled-exceptions.comhttp://twitter.com/sbohlen