So it looks like Tomb Raider: Definitive Edition is actually out in stores already available to purchase ahead of the scheduled date. GameStop stores are already selling Xbox One and PlayStation 4 copies a few days in advanced of the scheduled release of January 28th
The people over at IGN, have been able to confirm with several local stores that indeed that copies are being sold earlier than planned.
Twitter User RiseUp also showed photographic evidence that the game can be purchased
— J. Nally (@RiseUp44) January 25, 2014
Also if you aren't sure whether to pick up PS4 or Xbone version, read this