Summer Update Plan

Really? Are you talking about that "Fourth tier" thing, or all of the tiers? for potential.
Any other thing that might be different?

Everything.
The contents of Gachapon and other random-reward mechanisms are definitely different.
The chances of various cubes to rank up, or to give certain lines, can be different. (For proof: at one point we had an announcement from Nexon that the chances of rank up have been raised across the board. This was not due to some patch from KMS reaching us).
The drop table (items and their chances of dropping) are also different, although I'm not sure the Korean laws require those to be revealed.