On one of the screenshots of TTK there was the green XP levelling up bar at the bottom (I can't find the screenshot now sorry). So hopefully unlike the previous DLCs, we will have to level up the old fashion way for a while before light level kicks in again.
I don't know exactly how this would work as if we remove our gear we would all drop down to level 20 again.
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i believe it was confirmed that they will add in 10 exp lvls to make the core lvl 30 and assumed the lvl cap will b 50 or so