Looks like with the release of TaiGs jailbreak tool last week Apple has decide that they don’t want a beta to be jailbreakable. So they have pulled signing for IOS 8.2 beta 1&2. So if any new exploits where wasted in providing this jailbreak you can about say they will be patched.
So please don’t try to update to iOS 8.2 beta 1&2 now. It will fail and you will loose you jailbreak.