We should note that the game was recently announced and available in digital format for the PS4 over the weekend during the PlayStation Experience 2016. However we understand that some gamers might prefer keeping a physical copy of the game for collection purposes, or maybe they just prefer physical.
The physical version of the game will be available via GameStop for the PS4 and the Xbox One come March 2017. Right now the digital copy of the game is exclusive to the PS4, but it is a timed exclusive and the release for the Xbox One and PC will also take place in March 2017 alongside the physical release.
For those unfamiliar, Ultimate Marvel VS Capcom 3 was released towards the end of 2011. It is an updated version of Marvel VS Capcom 3: Fate of Two Worlds and for the most part, is more or less the same game with some slight changes here and there, such as the addition of more playable characters.