Who knows what they have planned, but I think a good way to go would be to a) reissue some or all of the older material on PDF and perhaps PoD, and b) provide a license that amounts to "Powered by D&D" with the correct edition indicated. I doubt any move by WotC in this area is going to be motivated by profit as much as it is about rebuilding goodwill amongst "ex-D&D customers" (that are still playing D&D in some form or another) -- probably as a crucial first move in the ramp up toward a 5E.
I say "a 5E" btw because I don't necessarily believe that whatever WotC's new edition of D&D will be called 5E. It will probably just be known as D&D and if there really is a movement afoot to repair the fractured D&D community, this "5E" will be built around inclusion rather than exclusion. Building a system or brand structure that embraces all versions and forms of D&D is probably the only way for the brand to survive as an RPG into the future.
Again, though, it's just speculation. I have been calling for a Legacy Support model for a long time, now. and would love to be "right", but the fact is that only WotC (and Hasbro, I guess) can know what is good for the company, the brand and the game. If it amounts to nothing, or even an even greater fracturing of the community, that's sad but not of any real consequence, given that I have already abandoned WotC and the new D&D.