What's odd is there really seems to have been exceedingly limited stock in the first batch (at least in the USA)...which is also why I'm hopeful they've been correcting issues before the next batch, but that is pure speculation (hope?) without any basis on my part.
I STRONGLY agree with you though @pennyboy, as I think 1440p strikes the best hi-res balance. For the current hardware generation, 4k is simply too many pixels to drive, especially if surround, all eye candy, 120+ fps, or 3D is desirable. On top of that, reading will almost certainly require scaling of resolutions to non-4x multiples such as 1440p for the benefit of the screen (as compared to just 1080p scaling) largely limiting its additional usefulness on anything short of a considerably larger screen. That will result in the majority of people scaling to 1/4 4k resolution (in effective pixels) to keep the acuity of reading text such as during browsing.
For me, 1440p presents the best of both worlds and a great compromise between resolution, rendering power required, and readability!
I'm optimistic and hopeful that the PG278Q will satisfy those requirements just about perfectly. 🙂 Otherwise, I'd have given up on my wait weeks ago.