Today i updated my server to 6.2-PRERELEASE, and it went well, even the em(4) card still works.
On my firewall, which i updated last week i am seeing several
kernel: cannot forward src fe80:0005::0201:6cff:fea1:bb22, dst fe80:0005::0240:63ff:fed3:ea27, nxt 58, rcvif gif0, outif lo0
But it seems to be harmless, as IPv6 works.
I suspect the reason are the temporary changes regarding net.inet6.ip6.auto_linklocal and since i set net.inet6.ip6.auto_linklocal back to 1 they seem to have disappeared.
I will update my last server (this one, the remote server) on Wednesday.
Currently i am planning to move next month, so unfortunately i will not have time for EuroBSDCon this year :-(. So maybe i will put 23C3 onto my timetable instead.