It's worth nothing that while the original post was made on November 17, the site has been updated more than once in that time, so it's hard to tell exactly when the brief synopsis first appeared. The site, which details most of the production details for Ant-Man and Avengers: Age of Ultron as well, give the following brief synopsis of Edgar Wright's Ant-Man:
"Biochemist Dr. Hank Pym uses his latest discovery, a group of subatomic particles, to create a size-altering formula. Though his first self-test goes awry, he develops an instrument that helps him communicate with and control insects."
While this is nothing mind-boggling, if true it does give us reason to believe that Paul Rudd will be playing Hank Pym and that we will, in fact, see his origins as Ant-Man. While that's been a pretty safe assumption, there has been a lot of speculation that Wright's film would focus on Scott Lang and some concern that Rudd had been cast as Lang, leaving Hank Pym, an original Avenger, out in the cold.
The site confirms that Ant-Man will film May 1 until October 1 of 2014 in both San Francisco and Atlanta. It also lists Big Talk Productions, the company which has produced all of Wright's previous films, as a production company in partnership with Disney.
Feature Film Casting's page also gives filming dates of March 1 through September 1 of 2014 for Avengers: Age of Ultron and reiterates the filming location of Cape Town, South Africa in addition to the UK, where most of the studio work will be done. I've often thought that Cape Town, which is beautiful and pictured below, would make for a lovely Wakanda, which might be a great place for Ultron to find some vibranium. It's also worth pointing out that the synopsis for Avengers: Age of Ultron is the same as that for Ant-Man, so there's some error there worth considering. Either way, it's worth a look!