Not yet, but as you posted before, that's my optimal wish list panel too. I'll try the 27, but will immediately trade it for a 34/35" panel. Can't wait for either of these. I don't think the PG27UQ 27" variant is going to be out for a few months, probably after the 1080ti comes out is my guess, and it'll be a few months before getting one will be easy, just like when the first 144hz ROG Swift monitors were released.
I'm guessing summer before I get my hands on one, and I'll have my Titan X and hopefully a couple 1080tis swapped for my current 1080sli cards, to see how 4k@144hz works with games on max detail settings. Really, really interested in seeing how AH3 will look maxed out, especially with all the beautiful skins guys like Greebo and Devil505, and others, are going to have made for the new version.