I'm going with we will see new material released but it'll be in support of marketing the new content. So TFA, ep 8, anything from the past will likely center on the anthology movies and whatever they do with Netflix shows. I don't see Disney green lighting material that doesn't support marketing the new content. Of course who knows where the content will go in the timeline.
I think you're correct, though I wish it wasn't so. The EU interests me personally far more than the new stuff.
We have seen various EU things introduced to the RPG however, and I hope we continue to see the likes of Chiss in the game.
Disney said they'll farm the EU for ideas but not to expect plots to be covered. FFG has certainly released races and such from the EU post canon purge so I'm sure that will continue but as for a whole sourcebook, I would never say never, but I wouldn't hold my breath or put money down either.
Well, we have already seen them mine the EU for story info in Rebels, such as the Hammerhead cruisers and Malachor in Rebels. Kylo Ren's crossguard saber likely had some basis upon the EU version, just with an extra energy blade on the pommel The RX-series pilot droids from the old Disney StarTours ride has been made canon courtesy of Rebels.
And from the look of the trailer, Rogue One is giving us Imperial Grand Admirals, or at least having what one presumes is a very high-ranking Imperial officer decked out in an all-white uniform that was the hallmark of a Grand Admiral. And I'm sure there are elements in the various canon novels that have their roots in the EU.
So like you said, small bits here and there making their way in, as opposed to large chunks.