It’s not the official list yet but they are already implemented in the update preview.
They aren’t awful in 1v1. I mean they excel on closed maps and are among the best civs there. So nobody expects them to be a top civ on open maps. But with the extra pa on scouts line they perfectly viable here atm.
Not too much I guess. Can be nice but won’t affect most games.
Probably but I guess mostly because people will try them out after the change11