Plenty: the way the wind is blowing a Fedayeen/3fleet alliance with the Tevs is distinctly possible, at least in the short term. Long-term? It's hard to say without understanding Universal Truth, and I don't have the temperament to try that.
ACT 3 ENDING SPOILERS
I dunno, the ending implies that the 3rd Fleet's new champion will definitely not allow that, too many axes to grind.
More likely that the 3rd fleet will form into a NTF-like splinter group
Laporte seems to have no intention of giving up her blood feud with the GTVA. And the greater issue is the GTVA will not be allowed to win, nor will the UEF.
If their Unbutu pawns folds, the Vishnans will issue a kill order on the human race to the Shivans. If the UEF 'wins' on very specific, direct orders from Shivans, humanity *might* and I emphasis might, be given a reprieve. The issue seems to be walking the line between the logic coding of two vast, alien intelligences that have no interest beyond using their pawns to achieve their ends. If there's a way to squirm out of their control, threats of genocide, or manipulation, it doesn't seem to be clear.