What I liked about Incarnate powers were that, for the most part, they didn't make you more powerful by just increasing your stats, but by expanding the breadth of your abilities - adding ranged attacks, team buffs, mez/damage procs, and pets to your repertoire. The exceptions, of course, were Alpha (which, as a pure stat-booster, was fine for a "starting" ability), and Hybrid, which I felt was a bit of a misstep, since it didn't really bring anything new to the table that previous Incarnate tiers weren't already doing (and, often, doing better).
I liked the idea suggested for Genesis in the Loregasms, which was ground patches that would simultaneously buff allies and debuff enemies. (I know there was an unimplemented version of Genesis in the I24 client, involving replacing previous Incarnate powers with better versions, but from the sound of the Loregasms they'd discarded that idea) They also mentioned a "debuff one stat to buff another" idea, though they didn't mention which Incarnate slot that was for. (I'd guess Vitae, but that's only a guess)
And Omega was going to be absurdly overpowered (with several different flavors of "overpowered", from complete invulnerability, to summoning swarms of full-powered clones of yourself, to making all enemies fight for you and then self-destruct, to having a set period of time where all your powers were on instant recharge). We'd probably have all that and more by now, and dozens of new powersets besides. It still makes me a little sad, even amidst all the hope and hoopla.