We're getting close to release for 5.2. As usual, lack of resource and the uncovering of bugs delayed things.
The last step - ensuring that migration of the openacs.org site from 5.1 to 5.2 works painlessly - is being worked on by Daveb (with a little bit of help from me) right now and is pretty close to working.
We may be able to give 5.2 a thumbs-up at the next OCT, if not hopefully the week after.