The transition should happen without any issues. You'll just be asked to refresh the game if you're playing during maintenance, so you can see any changes made to the game.
If you mean the Auctions, reload the game and the Transfers list will be repopulated. This is true for when you don't see players outside of maintenance. At the moment, you can't see players generated after you logged into the game until you've refreshed it. We're working on making this so that it's populated whenever you enter the Transfers list, but still no date on it.
If there are any issues, do not hesitate to let us know. It's a big change, so we're keeping a close eye on it.