The devs have added a functionality where nerfs/mods can occur within the proper timeline (1 month post release, 2 months post-release, etc), so don't expect stuff to instantly be changed once Velious releases.
This thread identifies some of the items nerfed and their spot within the time line.
Of special note is Donal's BP which will have its first nerf of increased cast time on day zero (originally 2 weeks post-release).
http://www.project1999.com/forums/sh...ad.php?t=90916
Stuff like improved paladin spell sets doesn't get added for a couple months.
http://www.project1999.com/forums/sh...d.php?t=141665
Hybrid xp penalties were removed a month into Velious.
Revamp planes/gods and triggered epic mobs about 4 months in. Revamp Chardok 11 months in.