^ Sony are hiring across the board and expanding their SIE studios. Its the same with Insomniac etc.
I definitely would expect that amount of hiring for Insomniac because the studio just has so many projects, but Santa Monica takes at least 5 years before releasing their next game. Hopefully it's for a future project then that Cory Barlog is working on.
With Ragnarok being the end of the Norse story, I personally would love if Santa Monica takes GoW into Egyptian mythology next!