The PI AF 2012 Beta 2 has been posted in the download center under pre-release. As opposed to the AFSDK CTP which only included the AF client, this posting includes the AF server, AF client and the Developer's kit. As with all pre-releases, these will time out and should not be used in a production enviornment. This is the last anticipated beta before release.
For PI AF 2012, the major areas that we would like to get your feedback on are:
1) Rich Data Access - for those who are not familiar with this, please have a look at the recording of a webinar on this topic here: http://vcampus.osisoft.com/auditorium/m/webinars/15224.aspx
In this beta we have fixed all known bugs and further improved the performance for accessing PI archive data.
2) Table lookup data reference that now supports time series data from external tables.
3) PI AF Builder enhancements that allows you to reset elements/attributes back to its template en mass, and ability to import attribute values from data references into your spreadsheet.