But D was only released a day or two ago, so it is too early to say.
Uh... no? Even version 1.0 came out at the beginning of January, and there were plenty of projects being developed on versions before that. Heck, registration for the community forums for 'D' go back to 2004.
Regardless, it's at least been used by the reknowned Kenta Cho for his Torus Trooper game, and (I believe) many others*.
*subject to correction
[edit] Actually, it turns out the top four games on his website were all written in various versions of D.