Mobile Vega is pretty much a given in the 15” MBP.
Given? When? 2018?
If they do anything, maybe bringing in a non touchbar 15” Pro to replace the lingering 2015 model at the low end, though I think they will probably wait until next year so they can use a 28W quad core U series with iris plus graphics in the absence of a 47W H series with iris pro...