During the Tank Update, for the love of god please don't change Sion too much!
I think that everyone can agree that Sion is one of the most balanced if not the most balanced champion in League at the moment. Whatever Sion does, you can do something about it, but then Sion can do something about THAT, and then so on and so forth. If anything, all the other tank updates should be modeled after him. The only reason that I would suggest changing Sion would be if all other tanks are getting a power boost and he would be left behind without similar treatment.