Vista - monthcalendar & datepicker removed

Rob Relyea said on 28th,december:

"There is no replacement in the December CTP.
A replacement will come back later in v1 or perhaps v2."

Where can we have the roadmap for theses versions ( v1 & v2 ) ?

It's very important for us to know if DatePicker and MonthCalendar will be
replaced quickly, because we need them urgently and the question for us is :
do we need to create our own controls , or do we wait the next releases...