Heard nothing about that...
Are you sure you are not confusing it with the LGW slots, where apparently easyJet, Norwegian and IAG were all fighting for them, and in the news headlines the Luton slots just happened to fall in to the same sentence/paragraph?
I don't think the Luton slots are worth a great deal, and unlikely to get the same news coverage.
I am still confused with the Wizz Air expansion announcement last week and if this was in part, them taking on some of those slots.
With easyJet having to work out a strategy for post-Brexit and them taking over a large chunk of Air Berlin and having to absorb this into their business model. I wonder if they are that bothered about further expansion from Luton and Gatwick for next year, as they seem pretty busy as it is!