I guess everyone was suddenly worried Marvel had blacklisted Hank Pym when they found out he wouldn't be involved in the Avengers sequel: Age of Ultron. Granted, being that Hank Pym created Ultron in the comic world, it was rather surprising to hear, but I don't know why him being in Ant-Man suddenly became news.
Despite the character being played by a few different people over the years in the comics, io9 was able to confirm that Hank Pym would be Ant-Man in the upcoming Ant-Man movie. Shocking, I know, though it is rumored that Edgar Wright's script will feature both Hank Pym and his eventual successor, Scott Lang.
As for Avengers 2, since it will be coming out before Ant-man, (Avengers 2 is due out May 1st, 2015 and Ant-Man Nov. 6th, 2015) perhaps they didn't want to steal the Pym thunder. We could see him cameo in the movie though, and the ultimate creation of Ultron could fall to someone like Tony Stark, who after retiring his Iron Man persona (maybe) tries to take his autonomous suit concept a step further.
For those in distress that Whedon is changing the origin of Ultron, consider it payment for him also diverging from the Age of Ultron title as well. He will be writing his own script which has nothing to do with the recent, horrible crossover and other than nostalgia, I can't see how having a different genius create Ultron will effect much in the movieverse.
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