We know from the Noble Victories
sell sheet that the set has more than 100 cards, so it's more than simply Red Collection (72 cards). Almost certainly, they'll put the 14 cards from the Victini Formation Decks into Noble Victories, making 86.
As for the pieces left, my guess is BW-P Promos and English-exclusives. Of the promos, Zebstrika is the most likely because there's a Blitzle in the Victini Decks. Some other BW-P promos that
might be in NV include Haxorus, Bisharp, Emolga, Druddigon, Golurk and Reuniclus, or they might keep some of those as English promos.
Maybe they'll make some new Roggenrola/Boldore and Timburr/Gurdurr cards to go with Gigalith and Conkeldurr. If they use the Reuniclus promo, maybe there will be new Solosis and Duosion cards. BW had spring Deerling/Sawsbuck and EP had summer D/S so maybe our autumn set (NV) will have an English-exclusive autumn D/S.
Assuming every single one of the cards I've brought up is in NV (which even I doubt), that's 101 cards. Either way, I think it's unlikely that we'll get anything that came after Red Collection in Japan. They seem to be pretty good with not mixing up future sets into the English releases; at worst, they save a few cards for a
later English, like how they pushed back Darkrai/Cresselia until the Darkrai movie was dubbed. (For Noble Victories, though, we already know that Victini is in the set and has multiple cards.)
Even the supposed "english exclusive" cards from the prior set were in Japan first by way of production technicalities. BW3 was announced back in June (along with a handful of other things which ended up in that set) which means the development of cards was already well underway, which is where the English cards would have been pilfered from. 
