Everyone seems super focused on Taliyah (which I can understand, she has been weak for too long) and for her it seems like there are too many possible directions that it becomes hard to imagine what happens.
AoE Q makes sense, changing the passive so her roamcapability is weaker at the same time I could see as well, how she interacts with worked ground has changed before and I could see it change again, maybe her ult empowers her abilities in some way so she is gated by ult CD a bit, which could also allow them to unlock her from mid via AoE Q, since she doesn't always have her full power like she currently has, W could apply grounded instead of (or in addition to?) interacting with dashes by damaging them.
So many ways she could get changes, but Olaf? What are they going to change? His ult has to remain pretty much the same, I guess they could move the passive resistances/AD depending on if it is active or not atm around? I also can't see how they would change his Q without fundamentally changing the character in a way that isn't "mid sized" anymore. Maybe a 2 charge system? Or a change to the CD refund when he picks the axe up? I could see them making it so the CD reduction for E is increased while ulting or only active during W or something like that, but then again I am not sure if it would actually change anything in how he plays? His passive could also get an additional effect?
Idk, I am honestly more interested in what they do with Olaf because it seems harder to add depth into his kit without fundamentally changing it.