What changes will come with velious?

[mnemonikos82]

This may have been already asked, but I can't think of what search terms to use that won't come back with 1000000 results.

Question: What changes to the game (other than the velious content) will come when velious is released (e.g. xp mods, suchandsuch item will be removed, agro changes etc.)? And what about patches after Velious was released, but before Luclin? What changes can we expect after release?