It is quite cool that on a 2.0 PC account, you can "see" 2.0 games and not see the 3.0 ones. Once a game has been updated in 3.0, it is no longer seen by 2.0 on the PC. That becomes largely moot less than a week from now, but it's still cool .
One thing that I have noticed repeatedly however is that a 2.0 Toy Box brought into 3.0 (at least on the PS4) "locks" all of the toys into position. You can re-program them, you can re-theme them, you can delete them and add them back, but you cannot move them. This is not a huge deal, but for those wanting to go back and tweak an old Toy Box, there can be considerable rework if you want to reposition any of the toys. Just FYI. Not a high priority item for patching, but hopefully will be eventually .