Speaking with Develop, Home game director Peter Edward said that Sony "probably announced it too early."
"Initially, there was real excitement from people, because we were showing something really different and that had a lot of potential," he said.
"And then there’s the realisation that, well, we probably announced it too early – GDC 07 was a long time ago. I think there was sort of recognition amongst developers of ‘Oh, this is interesting, but there’s still a lot of work to be done."
Full interview through the link.