Probably not the first time this has been said and I'm sure there will be loads of people who may disagree but it's time. The game needs to draw people back to it given the apparent exodus of late. New class(es) could help stimulate that.
e.g.
Archer/Ranger - a proper bow class with all the skills and perks associated plus new ones specific to the class and not cobbled together skills with Warden/Nightblade etc.
Wizard - not Daedra-based with perhaps a different magic path to the Fire/Shock/Ice
Druid - TBH I'm shocked this wasn't a thing for this year's story. Would have been a great tie-in to new toons joining the druids as a base story.
Anyway, just a few ideas.
Thanks for listening.
Gruumsh, Gruumsh, Gruumsh, Gruumsh, Miiighty Gruumsh!