This, amongst other things, makes my speculation meter tip towards the "No TESV" side. I mean really. TES V will be a HUGE FREAKING GAME!! You think Bethesda would just keep it all under wraps until 6 months till release? I don't think so.... I really don't. But who really knows.
Ya, I don't quite get the attitude of "we'll tell you when we're good and ready." I understand it somewhat from a marketing standpoint, but other developers whose games sell better than either Fallout or Elder Scrolls, let their fans know far longer in advance what they're working on.