We have posted a PI AF SDK Beta in the download center. This is a later build than the CTP2 and fixes a few issues that should make your development effort a bit smoother.
This posting is a bit unusual in that this is the 3rd pre-release that we're making available to you for this release. However, the scope of this release is very large, especially with the AFSDK, so we wanted to get as much feedback from you as possible.
As usual, if you have any question or run into any problems, please report them back to us as quickly as possible. You can post here, email to BetaAF@osisoft.com or directly to myself at firstname.lastname@example.org