It looks WealthFront started to misrepresent AUM on their web site. Their website now shows $1,550 million AUM for Month 34 (~September 2015). https://www.wealthfront.com/two-billion#100-million
Their SEC 13F Holdings Report for the year ending 9/30/15 shows $2,501 million AUM http://www.secinfo.com/d12Pk6.m1945.htm