The only thing that makes me feel better about the upcoming Cata changes for Boomkins, is the hope that they just decide to change everything back.
It seems that the initial impetus behind many of the balance changes was to offset the movement penalties to our DPS, with the way the Eclipse mechanic currently works.
From MMO-Champion BlueTracker | Cataclysm Class Preview: Druid
Eclipse: We are moving Eclipse from a talent into a core mechanic of the class and making it less random. Balance druids will have a new UI element that shows a sun and a moon. Whenever they cast an Arcane spell, it will move the UI closer to the sun, and buff their Nature damage. Whenever they cast a Nature spell, it will move the UI closer to the moon, and buff their Arcane damage. The gameplay intention is to alternate Arcane and Nature spells (largely Starfire and Wrath) to maintain the balance.
This makes me feel like someone just re-gifted something to me. That's pretty much exactly how it is now. The more crit you have, the more regular and predictable the eclipse. Wouldn't it have been just as easy to nerf the movement impediment, by say...making casting possible while moving when eclipse is active? Heck, even making them instant spells with serious cooldowns during eclipse would have worked. (Maybe.) I think that the devs could benefit from embracing the principle of Occam's razor a bit more on this one.
Otherwise, there are other complications like... A crit chicken without the crit is just, well...a chicken. We lose it as a buff, in our form, as well as through IFF, if I understand correctly. Is the intellect boost from the resto and Heart of the Wild sufficient to offset this? Will masteries really adequately address this? So many questions, so little time! Lastly, having a class that is hugely crit-dependent for damage have a shapeshift form that enhances crit was, if nothing else, harmonious in design. Aesthetically pleasing, intuitive, just wholly apt. Here's hoping the finished product keeps the boom in boomkin.