I've seen the sion, mundo and malphite buffs on the pbe, and while they may or may not be the correct buffs they are at least something.
So, which tanks (or tanky champions) are up next? I'm thinking Naut and poppy.
Naut should get some buffs to his e increasing damage to minions or perhaps revering the recent mana cost nerf, while poppy should gain a second more shielding on passive and/or 50% more base damage on q for the second proc.
These are the buffs I think these champions should get, but I could be wrong.