From what I understand it can depend whether the Ventile has been impregnated with DWR or not. If it is, it will bead water more readily (and I'm guessing your more performance-oriented cycling jacket is DWR impregnated).
Its a Fall / Winter 2016 piece, so won't be released for some months yet. http://circus-store.net/ is always good bet for the more unusual Soloist stuff (although they sell out very quickly, and don't always stock a full size-range in every piece). Otherwise check around other Soloist stockists like Haven late in the year, see if they get it.
Thanks, also a recent purchase, they are Vans x Unused tyvek covered authentics. They were made exclusively for Beams last summer (but I got them BNIB from a rakuten seller). I've seen some pics of worn in pairs where the tyvek has developed holes and tears and they look awesomely disgusting. Bit like paper GATS I guess.