For the most part I don't see a big change in the way I handle haste itemization-wise, except that I have to have ~2x as much of it before reaching the softcap.
That being said a lot of the decision will be based on the encounters in IC. Ulduar was king of HoT-rolling and what not, 95% + of our healing would frequently come from HoTs. Fast forward to ToC and the raid damage is more spikey, and less evenly distributed. Meaning more crittable Nourish/Regrowth, and less WG/RJ spam.
I'll probably run the first couple of encounters myself, try a few different things, look at my heals vs. over-heals and make a decision based on the spells I use, and how well utilized they are. Although, at this point, even if my distribution of spells is identical to ToC I'll probably still go haste first.
To add in some math; since math is fun! :D This approx. spell distribution from my last ToC runs (ignoring Tranquility, since the
spreadsheet doesn't have a place for it, and it's only like 1-2% anyway...):
RJ = 35%
Nourish = 35%
WG = 10%
RG Dir = 8% HoT = 5%
LB HoT = 5% Bloom = 1%
HT = 1%
I still pull out a stat weight of 0.69 for Haste and 0.22 for Crit. Even if haste would be, in effect, about 1/2 as useful this still puts it at 0.34 to 0.21 before the cap. But my understanding is that it's just as effective, we just need more of it. So I'd have to see a pretty big change in my healing mix before it would change my itemization any.
Edit: However I also don't have Nature's Grace at the moment, so I'm pretty much always going to be Haste > Crit. no matter my spell distribution.
Edited, Nov 4th 2009 8:45am by someproteinguy Edited more since I keep thinking, and my boss won't show up for work :p
As for the 'RJ ticks affected by haste' glyph; I'd have to say I'm likely not going down that path atm. I rather like having RJ up for the extended period, as this keeps the target swift-mendable. Plus I really don't put RJ on anyone who is in need of critical healing. But if there are more concentrated damage effects on a fewer characters I can see it being useful; and then using RG for characters you want an insurance Hot on. *shrugs* all speculation... ;-)
Edited, Nov 4th 2009 9:28am by someproteinguy