For Anub25HM, the only glyph that I considered taking was Starfall (and of course it would be remplacing IS). But after some testing I don't think it's worth it.. Add spawn every 45sec, and even with the glyph you only get Starfall every minutes.
Even if the 2nd wave of adds is not dead when Starfall get off CD, they will very soon, and Anub will be buried. It might boost your recount a little, but with no real utility.
Anyway Starfall will be up for the next wave of add after Anub comes back since it stay buried long enough.
But it get worst in "leech" phase, since adds keep coming at a 45sec interval, so you have no other alternative but using it every 1mn30sec to get the most dmg out of it, which nullify totally the benefit of the Glyph.
This is also the harder part of the fight, and the single-target dmg on Anub is really important once your raid have enough aoe dps to down the adds before the next wave. And to max single target dps.. you need Glyph of IS (even more since glyph of Starfall doesn't help anyway).
My point is : since Glyph of IS beats Glyph of Starfall on Anub25HM, then you should use IS (glyphed) even if it's an AoE-heavy fight.
Now what I found best regarding talents was 0/2 Imp MF and 0/3 Imp IS (but 1/1 IS), and use the 5 pts you get to take Typhoon and some mana regen. If you can eat your own Innervate, and find yourself with no real mana problems, you can even max Genesis to boost Hurricane dmg (because it will be a huge part of your dmg)
This is what I use on Anub :
http://talent.mmo-champion.com/?drui...Kk1N,U8S,10505
and so far I'm happy with it.