Pues mirad lo que ha puesto en xda:
So Guys.. Do You Want Me To Leave Xperia Arc Forum and Transfer Sony Xperia S.... Because I Wanted To Make A xTreme More Faster ROM On Sony Xperia S ... I Know There is Some Anti-Chaos And Pro-Chaos 
... But the Problem is No One Is Suppporting me Specially At DONATION thats why Soon.. Ill Leave Xperia Arc And Transfer To Sony Xperia S Maybe On September.. Please Support Me.. I Won't Sell My Xperia Arc.. Just Support Me Specially Helping me to raise Up mY Fund.
Yo entiendo que deja de dar soporte al xperia arc porque nadie le da fondos y se va a centrar en el xperia s para hacer una rom mas rapida, mi ingles no es muy bueno que digamos.