A reading of NANOG Mailing List https://mailman.nanog.org/pipermail/nanog/ (specifically July) will show that the vetting of the sale was undertaken and approved by ARIN. Specifically look at postings by John Curran, CEO of ARIN.
The sale is final. ARDC is operating according to their bylaws and charter.
------------------------------ John D. Hays - K7VE Kingston, WA http://k7ve.org/blog http://twitter.com/#!/john_hays http://www.facebook.com/john.d.hays