The contact person of this RFP is J.D.Baker from NIST. The effort is lead by Fred A. Cummins, Donald R. Chapin, and Claude Baudoin.
The RFP's work in progress page, which contains a link to the document and all relevant deadlines is located at this URL (Requires OMG access credentials):
So far, no proposals have been submitted, but Sparx Systems and HP have declared their interest and intent to submit.
The main controversy related to the RFP and subsequently to the proposals is about the role and positioning of a UML profile wrt the actual Archimate standard.