l like MJ but it seems she alwas gets the details wrong..
jupiter chould be DirectUI vnext but it could also be the SLR, witch inturn could be an implementation of the CLR except written by windiv instead of devdiv.
to me this seems the most likely, since it would leverage all the exsisting work that has gone into wpf, just running on a diffrent runtime..
who knows though, jupiter could also be some sort of win32 + managed.. it looks like alot of those Windows.* dlls are coupled to actual windows fuctionality.