Have to say Wonder is really amazing indeed with twincast + Spellstaff (added Waterwalking and Stoneskin to the mix to make it even more fun in my current game.

Luckyly had 4 nodes (aka got out of my way to get them) so i could without wasting many promotions.)
But since the Grigori have nothing else now (exept the Divine + Religion from Medics, but that sounds a bit like nonintended / exploit even if its nice for testing) and StoW takes a lot longer to reach now due to the new paths for bulbing + Wonder not beeing all that reliable i don't find it as overpowered as Meteor Swarm.
Still very nice but not completely over the top imo (and some minor imbalances are allright imo especially because the Grigori have been overnerfed by many changes anyways.).
If alone for the additional time to get them. Also Naval bombardment is not so effective and Terrain might a factor for most summons even with Extension 2. Also its a feat important only for Grigori / Amurites more or less...
Not completely unbalancing the magic-balance for all civs like Meteor Swarm did.
Also if stack busters should be nerfed (as opposed to removing crush from the list) its not such a big issue anymore anyways. Lets see what is to come.
And since escape is on the list it could go horribly wrong with 10 Summons in you capital and the need to walk back to the battlefield all the way. So luck is a bit of a balancer. Happens once in 20 Games perhaps but if it does, it might suck alot. Even if all but one Archmages go home and he gets unlucky on his rolls.
Sad to hear its not all that hot for Kyleen (still ok i imagine even if not on-par with domination). But that might be mitigated a bit by having a rather reliable supply of new Druids if needed so you can always Wonder-out-of-the-box with 4 Druids and don't need to shed a tear if one or the other goes down + they can walk impassable. Also its very much in line with Balseraph flavor.
But i imagine that especially for kyleen speed might be a huge factor again. I belive at normal Speed a pack of 4 druids casting Wonder and replenishing them if they go down is much more feasible than at quick.
So maybe i have to test firsthand at normal to see if that only holds true for quick gamespeed.