Still labeled 15K we first saw this single DMD laser-phosphor lit DLP projector at ISE this February. May-June was the expected shipping timeframe, and it looks like they are shipping as DPI just put out this promovideo and a product announcement page. I am not sure if DPI is plan ning an XPR '4K shift" version of this, I though I saw/heared something like that at ISE, but I have no clear confirmation. It would make sense though as every platform seems to be expanded by the optical actuator and an associated imageprocessing wether the later is manufacturer specific or provided by DLP maker Texas Instruments.
https://www.youtube.com/watch?v=OicWeQiiWpc
https://www.youtube.com/watch?v=OicWeQiiWpc