It is a large amount of changes, in line with any other big alpha. We have more programmers than ever working on it, and there are a lot of system level updates going on or planning to happen, which are not necessarily flashy features to players, but help the game run better. Much of that will be needed to get all the PC features running on the new gen of consoles, as they may be better than the last, but are still limited in some ways compared to a mid tier gaming PC.
Thanks
Flying dogs with no collision will work perfectly.