Updates on the "1v1 system"
It's not just 1v1. It might also be called Arena Tournament now instead of Training Ground, however, this could in theory be something completely new.
It is 3v3 and 5v5, so you can get rekt by 5 noobs not just 1
You can make your own team / be in multiple teams. You can make your own team name.
The developers examples for team names:
... not even joking those are the examples given in the code comments xD
Personally I think The Flying ***** is a great name, just have to see what the DO mods would make of it ^^