Yeah, I happened across that picture because I've been doing research on Arakawa-sensei's influences/inspirations/sources, etc, for a lit-review-type article on FMA that I'm writing (30 pages long so far...ahaha XD). No luck finding anything else on it yet, though! The other place I saw that pic was the following blog (not that it really helps, lol!):http://www.tumblr.com/tagged/hiromu-arakaw...fore=1336669474
I tried to link you to the exact page with the pic (it was on her birthday this past month), but the blog is always adding new posts, so...
The pic also shows up now on the right-hand side of the screen in results if you Google "Hiromu Arakawa."
And I agree, based on that small pic from the awards show years ago, it does look like it could be her. So weird that it just came out of nowhere though! I noticed it a couple weeks ago on the blog, but didn't mention it until I saw it show up on Google this past week too.