The whole point of OneD&D - the reason they are calling the play-test *One*D&D - is that WotC recognizes the damage the misuse of editions, and of the word "edition," has caused to their brand. That's why, moving forward, they are so emphatically rejecting the word "edition" and just calling the game D&D.
TSR invented the notion of the edition as a new, must-have version of the game because they didn't want to pay royalties to Dave Arneson (look it up). Edit: They fought a lawsuit trying to prove that it was, in fact, a whole new game. Then Lorraine Williams was staring bankruptcy right in the face, so repeated the same tactic with 2e. And so on. WotC doesn't want to do that anymore. They can see how it fractures their brand and player base.
And they can see how it has enabled 3PP to lay claim to the game, which is exactly what Kobold Press is trying to do in the situation at hand. They are exploiting the confusion around what "edition" means in the context of D&D to portray themselves as the true guardians of 5e. A game which, I remind, they did not create.
I can see why that would annoy WotC. It makes the OGL situation look a lot more reasonable, because KP are doing exactly the thing that WotC fretted about. It's just KP, so WotC don't have to worry too much. But what if it was Disney?
