2K Sports has announced that NBA 2K21 will release September 4 on PS4, Xbox One, Nintendo Switch, and PC. We also now know that the standard edition of NBA 2K21 will cost $70 on next-gen consoles, making it the first game for PS5 and Xbox One X to cost more than the usual $60 price for new games. Additionally, you won’t be able to upgrade NBA 2K21 from current generation consoles to next-gen consoles for free unless you purchase the just-announced Mamba Forever edition for $100. Pre-orders are starting to go live for all platforms, and each edition comes with some a bunch of bonuses.The Mamba Forever edition commemorates the late Kobe Bryant and rounds out the trio of cover athletes for NBA 2K21. We learned earlier this week that Portland Trailblazers star Damian Lillard would be the cover athlete for current generation consoles, while young phenom Zion Williamson will fittingly be on the cover of the PS5 and Xbox One X standard edition.While other next-gen crossover games such as Madden NFL 21 and Assassin’s Creed Valhalla have announced free upgrades from current to next-gen, NBA 2K21 is incentivizing purchasing the expensive Mamba Forever edition instead. If you plan on…