Odds? 50-50.
Its just as likely that the next shipment of current-gen K2's got delayed or that they underestimated the sales impact of their impromptu price drop. (Remember the bit about a "tripling of the rate of growth"?)
Still, the (Circumstantial) evidence for a new Kindle lies in the timing.
Bloomberg was reporting a new kindle would be arriving in august.
And the K1s went out of stock just before K2 was announced.
(Even though they continued to sell for a while afterwards.)
The thinking is that sales of the old model stop shortly before the new model is announced so as to minimize the customer service hassle of K2 buyers switching to K3.
Nothing but speculation at this point, though.
Those who know ain't talking and those of us talking don't know squat.