Every Xbox Live Gold active subscriber will be receiving free access to NBA 2K15 this weekend, as a celebration of the NBA Playoffs. You will be able to play it starting with 12:00 p.m. PDT April 24 through 12:01 AM PDT Monday, April 27. If you decide to buy it after this weekend, your whole progress will be carried over to the full game.
To sweeten the deal even more, the game is now 40% off of the MSRP, with 15,000 VC included in the pack. The game will be available via the Gold Member area from the Xbox One dashboard.
Source: Xbox Wire