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mandymtt - That magazine is called "
Fresh GanGan" and that pic is the cover of the current issue on sale in Japan (though it is called Dec. 2009 issue. ^^)
The magazine is from the same publisher that brings out "
Young GanGan," the one with FMA. But, unlike
Young GanGan,
Fresh GanGan magazine usually carries one-shot comics from up-and-coming manga artists. It says they have 16 of such one-shot comics for that issue.
And, it looks like they also have FMA bonus gift (FMA pin-up poster) and giveaways of some FMA merchandise, and hence the FMA cover.
And, it's in conjunction with some giveaway merchandise for "To Aru Majutsu no Index" comic series, and that cute girl next to Ed in the cover pic is the main character from that comic. (edited & corrected. Thanks, kkg22104!! ^^) It may have some FMA color pics and such inside also, but I can't get a good connection to clearly read the cover. Anyway, that's what the pic is. ^^
And.. the best place to post this kind of question:
Depending on the stuff in question, I suggest posting on either
FMA merchandise or
FMA official news around the web thread. If it's a magazine cover or scanned pages of some article, and you would like to know the content of the article (more likely they are in Japanese, right?) then post that on
FMA official news around the web thread, and hopefully, I, or someone who can read Japanese can help out. Or, if you just need to know what it is, like this case, then
FMA merchandise thread should do, IMO.

I'll move this one to
FMA merchandise thread in a while.