I don't really think it's 15 abilities... they said '15 additions', so they could mean that 4 abilities (ultimates) plus combat summons (nihils) and new dragon weaponry from Muspahs are 'additions'. Granted, it doesn't really add up to 15 but we'll wait and see. I doubt we'll get 15 abilities right off the bat like that.
And well... Zaros content isn't that huge pre-Mahjarrat storyline, so IMO the game was slightly heavily Saradominist biased (if it's mainly the followers we helped in quests) in 5th Age.
Please remember that for a long time we don't know who Zaros is or what his alignment was, but a lot of people back then (opinion of mine) might have believed he was evil because of old lores/history back then, and that Zamorak was 'better' than him because he was a less 'evil' version of him, hell, non-canon God Letters used to imply that Zaros was worse than Zamorak is and he's meant to be 'evil' or sorts! Hell, even then back, I used to think that Zaros was like a counterbalance to Guthix AKA Unbalance or something silly like that (pre-alignment). You can't be balanced all the time because it's too 'Mary Sueness' as some of you guys say.
Frankly, I'm content with Zarosian updates, but I'm happy to see more Seren, Armadyl, Bandos, Zamorak (he's still missing good stuff about himself!!!) and Godless. I don't care much for more Saradominist content if it'll just cause a ruckus between Zarosians and Saradominists - MULTIPLE TIMES ALREADY. It's getting old. I'll rather see Armadyleans versus Bandosians (despite Bandos' death!...) or Zamorakians versus Godless... Anything but this tedious old tired Zarosians vs Saradominists!...
02-May-2014 16:55:10