I'd guess the movie will have little to no connection to the comic storyline of the same name, as it's a big jump to "let's introduce the Ultron character" to "have Ultron take over the world and have him stopped not by the Avengers whatsoever, but by Invisible Woman and Wolverine."
So Thanos is being saved as the big bad for Avengers 3, apparently.
"It breaks your heart. It is designed to break your heart. The game begins in the spring, when everything else begins again, and it blossoms in the summer, filling the afternoons and evenings, and then as soon as the chill rains come, it stops and leaves you to face the fall alone." --- Bart Giamatti, on baseball
It is weird with all the Guardians of the Galaxy casting news. Most of the characters are related to Thanos in some way. So, I guess Avengers 2 will be dealing more with the events in Ant Man than Guardians. It is a good move if you think Ant Man is not going to be that profitable. Saying that its the prequel to Avengers 2 than any of the other films.
The Wee Baby Sheamus.Twitter: @realjoecarfley its a bit more toned down there. A bit.