Zapdos is def going to be a welcome addition to the tier, and despite a somewhat limited move pool I can see a bunch of viable sets sprouting up. Some that come to mind:
-agility: thunderbolt heat wave then either HP ice or grass with agility could work as a late game cleaner that can set up on the likes of coba, doublade, crobat, forrey and many other Mons because of its very cool typing
-sub roost: with a set similar to kyurem zapdos could more than likely make good use of pressure with its typing and bulk. You could even forgoe a coverage move and go one attack toxic sub roost and go full on cancer lol
-specs: not to sure that this will be incredibly good thanks to lack of super strong stabs minus possibly thunder, but its def a set i and others will give a try and could act as a strong pivot.
Defensive: like I said before zapdos's typing ui very cool giving it resistances to flying, fighting, steel, grass, bug, and an immunity to ground so a defensive (more than likely physically defensive) set could work well for it especially with defog and the ability to pivot with volt.
-offensive defog: I could see it running a set similar to special defog mence however I'd probably go lefties before life orb. Again its cool resists give it the ability to defog on a lot for offensive teams
Just my guesses on what some of its set and how they could fare, I think it will find a good home here in UU and I'm very happy to have it n_n