Take-Two has indicated that WWE 2K15 might not release in its normal window. The information comes from the most recent earnings release.
A number of upcoming titles are listed in the release, including NBA 2K15 (coming October 7 for Xbox One, Xbox 360, PS4, PS3, and PC) and a number of titles for "Fall 2014," including Borderlands: The Pre-Sequel, Civilization: Beyond Earth, and Evolve. WWE 2K15 is listed for "Fiscal 2015," which could be as late as March 31, 2015.
On its year-end earnings call, Take-Two shared that NBA 2K developer Visual Concepts is aiding in development. The title will be coming to PlayStation 4 and Xbox One in addition to last-gen systems.
This could very well indicate that the game will miss its normal release in the fall.