I think the Purple Wedding will be the season finale. The Red Wedding has been confirmed for 309 "The Rains Of Castamere" which would make a nice line up of weddings: Tyrion/Sansa in 308, then the RW and finally the PW in 310. Don't forget that the Littlefinger rescuing Sansa/ Sansa marriage plot is being heavily set up in this season, and I think it will conclude with Sansa's escape during the chaos of the PW.
Varys is accustomed to, and plans for, failure. He's the antithesis to Littlefinger, who seems to always manage to succeed. When Littlefinger finally fails, he'll be ruined. Illyrio and Varys, if you can recall, were partners from childhood. Varys would steal things from people, and Illyrio, a young sellsword would 'reclaim' them for a reward. Their enterprise scaled up from there.
At the time of GoT, Varys' plan
was Viserys, who would invade Westeros with a Dothraki horde (If you look at Illyrio's comments in DwD, he didn't think Dany would even make it out there). Verys sending out an assassin to kill Dany + child was probably a necessary concession to maintain his cover. In fact, it could have been done with the hope of inspiring an attack, looking at how Drogo reacted to the mere attempt of Dany's murder.
I honestly believe Aegon is a fake, the 'mummer's dragon' before a cheering crowd. He'll take King's Landing in the next book, and be seen as a restorer of peace, hence the cheering crowd. but he belongs to Varys, the ex-mummer. He's cloth, and cloth burns.
mllNY, if you want to remind yourself of some of those finer details of Jon's potential parentage, break out GoT, and find the few chapters of Ned's where he's in the black cells before he gets the chop. In one, he has a fever dream about a place called the Tower of Joy. Read it bearing in mind the possibilites and you'll wonder how you ever missed it!
I agree Che, Jon isn't done. If you bear in mind what we learned about warging from Varamyr's prologue, and the imagaes from Rh'llor in Mel's chapter, it's clear that Jon has both time and a person with the knowledge and and reason to save him.
This is going to upset a lot of people (many of whom think that the three riders will be Dany, Jon and Tyrion) but I don't think Dany will have control of three dragons for much longer. I have no doubt that Euron's horn works (though not in the way he told Victarion) and that he will end up in control of either Rhaegal or Viserion or even both). The Ironborn are going to become major major players in book six, even if we all know that they wont win.