It appears that ADV is involved in the production of the anime in some way.

I found this in a staff listing [credit: F.A.T.] One of the entries for Aria is simply "Mag Garden x AD Vision", which doesn't say very much, but it is certainly telling.

Other info I was able to see: the debut is scheduled for Fall 2005, and a broadcaster has not yet been determined. Also of note: many of the staff, including director Junichi Sato, worked on Kaleido Star.