The only "semi-offical" word on either was on the recent earnings call, when Eisner said Space would open "in the Fall". He made no mention of Philharmagic.
gcurling is right, there is nothing else official from Disney, and all we here are rumors.
My GUESS is that Space isn't going to open until at least August/September, and due to that later opening they will open Philharmagic in the Spring, so they have something new for the Summer. That's assuming Philharmagic is not delayed for its own production reasons.
We go in May, so I'm hoping its open then, but am not really counting on it.