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 ...