They were monitoring the category until the beta period expired. They did extend the beta period but the only comments since were from people who couldn't get the new license file to work.
Since they refused to issue a new build, there really isn't any point to continuing to test. I think everyone has stopped testing, that is why there are no new bug reports in the forum.
On the flip side, usual SAP process is to get 2 or 3 of their biggest customers to test in private and have no public beta at all. So PB15 having a beta period publicly open to any customer is a big change for them.