I withhold judgement on the cards until after we see them.
The fact that we're already being hit with the "Complete X" books does not bode well. At all.
I'm thinking the opposite, but then again you are a critic/cynic of 4th edition and I am a fan/optimist of it.
the PHB is fuller than ever with powers this time as all class get these neat things to do, now in the PHB there are 4/3 options at each level including paragon paths, while this is playable, I as well as many others would like even more options, which is what these complete power books will hopefully provide I imagine an extra 3-4 powers per level + 4-5 paragon paths and 4-8 epic destinies.
It seems also they are only releasing them when the Power Source has reached its full complement of classes, 4 from what I can see. This would leave me to believe the Divine Power coming out in autumm(fall)/Winter next year and the Primal Power coming out in spring next year, with the PHB 3 which will contain the Shadow and Psionic and hmm another source, with 4 of one source and 2 each of the other two leading to a Power book of one of those sources in autumn that year.
So I see the release list a bit like this (in terms of PHB's and Power books):
2008 Summer: PHB
2008 Autumn/winter: Martial Power
2009 Spring: PHB 2
2009 Summer:Arcane Power
2009 Autumn/winter: Divine Power
2010 Spring: PHB 3 [for Psionic, Shadow and Ki? heroes]
2010 Summer: Primal Power
2011 Autumn/winter: [Something Power] the source which has 4 classes from PHB 3
2012 Spring: PHB4
2013 Summer: [Something Power] one of the 2 sources which has 2 classes from PHB 3 and 4
2014 Autumn: [Something Power] the remaining of the 2 sources which has 2 classes from PHB 3 and 4