Battle system changes - While HS only put some new actions for the jobs, SB will revamp the entire battle system, so even low lv skills will be changed, added or removed. And btw, the job gauges looks sexy.

The cross role system is a cool upgrade too, so many usefull skills with only 5 slots to fill in. Expect to make a lot of hard decision of what to use.

Artifact armor from the get go - As soon do you get your lv 70, you will be gifted with your cool brand new artifact armor to run the endgame dungeons without being undergeared. I hope they do a cool first step for relic weapon too, like ARR.

PVP Changes - Yeah, finally I can try pvp without having to pop 10 cooldowns in 5 seconds. They went for a more simplistic system, more like Guld wars 2 (who has a very sucessfull pvp). This pre-season will help to adjust and who knows, the next step will include a siege castle/territory war between clans...