I'm betting this is a pretty "vanilla" update as far as new systems go. It doesn't seem they are introducing any new questing feature/mechanisms. Even the Ranger pass does not seem to be offering anything new, just applying existing abilities to the ranger enhancement tables and re-naming them.
Even for the new quests...they have re-used some of the art-work and areas.
I'm encouraged that this will be a mainly bug free update. The only hiccups I see could be they might need to tweak ranger enhancements to add or reduce power.