Next Gen will be Cheaper to Develop for - not more expensive [According to my Source]

[IsawYoshi]

According to an article I read on gamasutra, they need more workers. The dev. of the ps4 killzone game said that they had increased from about 130 workers to about 150, as far as I remember. Now I don't see why they would need more workers if it takes shorter time to make engines as you said.