As Amazon UK listson the product's page, that Dead Island 2 will be available on PS4 and Xbox One on April 24th 2015, while the PC version of the game isn't currently mentioned.
There's no official announcement from Yager Development and Deep Silver, so you might be well advised to take the news with a pinch of salt. Dead Island 2 will support cooperative mode for up to eight players simultaneously. You can read our hands-on impressions for more detail on the upcoming zombie slasher.