The epilogue scene in the fifth book of A Song of Ice and Fire confirms that the new central political question surrounding George R.R. Martin's epic is why Pentos cares about the governance of Westeros. Assuming -- for the first time -- that Varys is a reliable narrator during his mustache-twirling soliloquy with Ser Kevan, his intentions are now clear: he has played a long game for Targaryen restoration, with Illyrio Mopatis as his Pentoshi agent. (Or maybe Varys is Illyrio's Westerosi agent. Who knows.) The basic question is why. We have insufficient textual basis to answer as yet. But the game just got more fierce.
With that reveal, Varys' actions in A Game of Thrones now look rather inconsistent with that goal. After all, he set into motion Robert's plan to assassinate Daenerys and her unborn Rhaegal. There's no real textual reason to believe that he sabotaged the plan: Ser Jorah's guilty conscience unraveled it. But Varys collaborated with Illyrio to broker Dany's wedding to Khal Drogo, a route to Targaryen restoration that ran through Viserys (assuming that Varys & Illyrio didn't believe that Viserys' essential Viserysness would botch the whole thing) and not young Aegon, whom Varys tells Ser Kevan is the linchpin of his long-hidden plan for the Iron Throne.
So what's going on with Varys? Two theories, after the jump.
2. Varys wants Aegon Targaryen on the Iron Throne. It's a theory with three virtues. First, it's what Varys tells Ser Kevan Lannister before killing him. Second, it's a neater theory for Varys' complicity in an attempt on Daenerys' life. And third, Varys would be kind of an idiot to bet the future of Westeros on a vessel as unworthy as Viserys or as unknown as Viserys' baby sister. Better to help Jon Connington spirit Aegon away and teach him how to be a king in secret. The big flaw in the theory: Varys' ally Illyrio cleary aided Viserys and Daenerys, including providing Dany with her dragon eggs -- though who knows if Illyrio suspected they'd hatch -- so he assisted in providing competition to Aegon.
You can also see other flaws in this entire scenario I've outlined. First, Varys is heretofore untrustworthy, so why see him as a reliable narrator now? Second, I've implicitly assumed that Varys wants to aid Westeros by bringing back the Targaryen Dynasty. How safe an assumption is that? It all leads back to the central question mentioned earlier: what does Pentos want with Westeros? The Winds of Winter had better deliver some beginnings of an answer.