As I understand it, folks are going to get their rep for questions adjusted. This has already happened for some users. When will this process be complete?
The change was retroactive, so it's like upvotes on questions were always worth 10 points. Therefore, there's no sudden jump in anyone's reputation graph.
Take Yoichi Oishi, for example (who probably gained the most from this, at least on this site):
Glorfindel wrote a query so that you can estimate how much reputation you gained from the change.