We will update to 1.12 if all plugins are 1.12 compatible and tested. But we support 1.12 already so you can join with 1.12 but can't use the items etc.
At least you guys have it better than my server does, the new version for the mod we use crashes when you take your armour off, or do other normal things which shouldn't crash you XD so we're having to wait for probably a longer time than you, don't worry about Mega updating and remember your patience