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None of this will ever be investigated in any meaningful way. Let's remember, first off, that Bush doesn't leave office in November, but in January 2009. That gives him a good long while to draft all of the blanket pardons necessary to cover anyone who was ever remotely involved with anything that could conceivably be illegal, including himself. And he only has to worry about that if Obama wins the election.
In fact, if he were especially crafty, he'd pardon everybody involved except for key Congressional Democrats. That would guarantee the swift death of any attempt to get investigations off the ground.
The lawsuits against the telecoms was our last, best hope for bringing these issues to light, but since those are dead, there's no possibility for accountability.