I was taking a look at the changes to jobs for 4.0 and see that skills will be upgraded, bard for example, with the level 64 trait "Bite Mastery" Venom Bite and Wind Bite are upgraded to Caustic Bite and Storm Bite respectively.

Does this mean that we only have to have the 2 skills and not 4 on the hotbars? and they will change automatically via level sync?