I don't get how a long-ish development cycle ending with staff moving about is worth worrying about. Sure, it's weird that Square-Enix are sitting on a trailer for months now but a handful of people shuffling their jobs about doesn't mean anything's been derailed.
Also, Deus Ex Human Revolution was awesome. Easily one of the best games last year. How does some staff reshuffling make you think Thief 4 won't be?
I'm also kinda hoping Eidos Montreal isn't in trouble. I just applied.