Thx Bongo. 8)
Hmm...very interesting indeed.
However, despite the best of starts, Prey’s development was troubled. Seemingly insurmountable technical problems ground development to a near-halt, and eventually, the game was put on indefinite hold in 1999 (although never formally cancelled, contrary to popular opinion). Later, on an internet discussion board head engineer William Scarboro would comment that "In hindsight, portal tricks such as these should be used as tricks, not as an engine paradigm."[2]
Somewhat enigmatic, but if I had to guess I would say that Prey got too big for its britches. Perhaps they invested to heavily in eye candy or gimmicks whose wow factor ended after about five minutes without putting enough solid gameplay in place.
The Portal stuff (demoed by Paul in the video) may not have had any real practical application with regards to gameplay, which is an assumption that stands at odds with his claim in the video interview, where he hints at the fact that "creative players can start to see the potential for a multitude of uses" (paraphrase) for this technology.