The forums have just been upgraded and while most everything should continue to Just Work, if you are subscribed to any of the feeds, you will need to update your URL's. The one you probably want to use is this one which will monitor all activity in the forums.
I have to say, the new software looks quite nice. Working with the old phpBB2 was always a massive PITA but version 3 looks very slick. And before anyone berates me for waiting for so long before upgrading, we get a huge amount of spam and until recently, phpBB3 didn't have enough to help with the problem, nor were there many mods available either.
Anyway, have fun with it and let me know if you see any weirdness... 🙄