I'm fairly certain the conversation went something like this.
R&D Member #1: Well, 2014 is three years away, so if we're going to make a new edition, it's time to start developing it.
R&D Member #2: So what do we want to address in the new edition?
R&D Member #1: Well, obviously the market is split. 4e's doing good, and DDI's been a money-maker, but Paizo's doing well with Pathfinder, and there's a lot of activity in the OSR. If we can tap into all of these markets, that'd be pretty awesome.
R&D Member #3: Hmmm...an edition for fans of all editions? I like the sound of that! But that's going to be a tough bit of design.
R&D Member #4: Say, public playtests are pretty popular. What if we hold a huge public playtest, over the course of two years? We'd have a much better idea how the game will be accepted by the various groups, and we could bring back some of the freedom and customization of 3e without the balance problems.
R&D Member #5: But what do we sell during that time? No one's going to want to buy 4e product while we're publically playtesting the next edition.
R&D Member #1: Well, DDI brings in about [REDACTED] dollars a month. Even if that drops off a bit, we can make up for that with collector's reprints of old editions and some edition-neutral product. Maybe get back into the PDF game. The board games are doing well, and we've got the digital rights back from Atari. That should be enough to pay the bills!