There have been $50 promotions in one form or another for the Xbone for a while now. Packed in free game and $50 on top though I'm not sure. I think the TF bundle is a limited time deal but not sure.
"I've said several times in this thread that PS4 doesn't need a single game TitanFall killer. It being $100 cheaper, the better multiplat performance, plus a diet of diverse games is all the competition TitanFall needs."
Yup, the large disparity in performance on blockbuster franchises at lower price is very advantageous for Sony. Sony developed one hell of a console and are being rewarded with great sells for it.