Apparently that was just too darn boring for a hotel here... The ArchPaper (via Curbed!) has the latest, um, look:
Per Curbed's description:
This terrace will reportedly hold a hydroponic bamboo garden growing tall outside the hotel windows. The Hyatt's vertical extension will be capped by two floors faced in glass. For a final flourish, the corner over Fourth will get a halo framed in metal.
Meanwhile, this will be soon joining its classmate down on the Bowery...