On a first glance it seems that nothing specific will be lost permanently.
There'll be temporary disruptions until stuff is again going as normal, that certainly.
Obviously we cannot check everything. Xenforo offers a free demo of their v2 software here https://xenforo.com/demo/ , where you can play around yourself with everything in it. So far we did not find anything problematic. But obviously we will need everyone's help after the move. If someone feels like checking with the demo before the move already, then this would be very welcome.
There'll be temporary disruptions until stuff is again going as normal, that certainly.
Obviously we cannot check everything. Xenforo offers a free demo of their v2 software here https://xenforo.com/demo/ , where you can play around yourself with everything in it. So far we did not find anything problematic. But obviously we will need everyone's help after the move. If someone feels like checking with the demo before the move already, then this would be very welcome.