According to the Tower of the Hand summary:

Bran meets the three-eyed crow. It's Bloodraven! They don't know who Coldhands is, but get confirmation he's undead. Bloodraven is still alive as he's been 'plugged into' a weirdwood, and can now see through the eyes of the trees. Bran gets this treatment as well and starts seeing visions from the distant past, including a time when the First Men made human sacrifices to the trees.

Tyrion is headed to Daenerys in Meereen. He meets a mercenary captain, 'Griff', and his band of no'er do-wells, including Griff's son, 'Young Griff'. They sail down the Rhoyne to Volantis, planning to join up with the Golden Company (the 10,000-strong mercenary company consisting of exiled knights from Westeros), wait there for Dany and then go and kick some arse back home. Tyrion works out that Griff is Lord Jon Connington, Rhaegar's best friend who was Hand of the King during the rebellion, but was sent into exile after losing the Battle of the Bells to Robert Baratheon. He realises that Young Griff is Aegon VI, Rhaegar's son, after Varys did the old baby-swapping trick. Tyrion asks Aegon about how he's going to square his claim with Dany's, given that Dany has three fricking dragons. He suggests that Aegon needs something impressive, such as already having invaded Westeros and set up a foothold for Dany to use. As Tyrion is congratulating himself on his own cleverness he gets recognised in a riverside town by Ser Jorah Mormont, who captures him and thinks to take him to Dany as a sign of loyalty.

At Volantis Connington hears that Dany is dead-set on staying in Meereen, which is the most retarded thing he's ever heard. Aegon says screw it, she can have it, and suggests they invade Westeros themselves. The Golden Company is well up for it.

So Tyrion, in a conversation lasting ten minutes, has just thrown Westeros in a bloody new war, complicated the War of the Five Kings and probably thrown a wrench in Dany's plans as well. Awesome

In Meereen Dany is visited by Quaithe who warns her about the mummer's dragon (maybe Varys was full of crap after all, then). Dany's dragons start eating people at random (NICE), so she chains two of them up in a pit. Drogon is not impressed and flies off, leaving Daenerys with no dragons and in serious trouble when Qarth, Yunkai and half the known world declare war on her.

Theon, who is now Ramsay Bolton's Stockholm Syndromised-little-biatch, negotiates with the ironborn at Moat Cailin (who've been driven half-mad by the constant raids by Howland Reed's crannogmen) and convinces them to surrender. Ramsay then butchers them all. Roose Bolton's army arrives and we meet the fake Arya, who turns out to have been Jeyne Poole all alone. NOT A SURPRISE.

On the Wall, Jon Snow discovers that they cannot feed all the new wildling allies and recruits. Oops. Stannis has set out to win the North to his cause, and starts off by liberating Deepwood Motte from the ironborn and taking Asha Greyjoy prisoner.

Davos goes to White Harbour, presents his case to Wyman Manderly, and is promptly arrested and taken away to be executed. Except he isn't, as Wyman has faked his death (this trope may be getting a little worn, but okay). Apparently Rickon is on Skagos, the home of the unicorn-riding cannibals from hell, and Davos has to go rescue him. WTF? I'm not sure why Osha thought it was a good idea to take him there but whatever. The Onion Knight lives!

It also turns out that Mance Rayder is still alive. Melisandre faked his death by switching him with the Lord o'Bones and using magic to mask their appearances.

That's about it so far. Someone else can keep up with them.