While a good game in its own right, I'd much rather see thatgamecompany concentrate its efforts on creating a brand-new game as they have done all other times. Since the developer is no longer under an exclusive contract with Sony, however, it's doubtful that we'd see them hashing out a second Journey when Sony probably has the rights to the IP.
If thatgamecompany is taking their business multiplatform, this will likely set a course for a new property... but whether it happens to land on a PlayStation platform or stay elsewhere (in the mobile department, for instance) remains to be seen.
Journey is one of the most memorable as well as moving games I have played. We can only hope that ThatGameCompany releases yet another awe inspiring game. As they have already ported Flower and Flow to the PS4, maybe we will also see Journey ported too.
ThatGameCompany is working on another release. Whether it be a follow up to Journey (which I doubt) or something else equally as wonderful; I look forward to their next creative endeavor. Mur