Even if you have no interest in fps I'd say watch the trailer, it's literally pixar quality animation.
It's a new multi-player FPS from Blizzard. Anyone who watches any gamer on youtube will probably know what it is.
If you don't, simply put it's a multiplayer fps with extra mechanics in the form of character abilities which can range from teleport and revert time to landmines and rocket salvos. It's still a really easy to learn game due to the easy shooting mechanics and the clearly defined roles of which there are 4. Offensive characters are great at getting close and doing damage, defense are good at holding choke points, creating area of denial and long range attacks, the tanks are good at soaking damage in one way or another and the support focus on healing, shielding or armouring. Actually that was a longer explanation than I wanted.
A lot of people were expecting this game to be f2p with skins being the only paid for item. I was always a little skeptical of this, the game's been in development since 2011 I believe? I know it uses some of the things from the cancelled MMORPG Titan anyway. Anyway at Blizzcon they revealed it'd cost £45 or your region equivalent. Guild Wars 2 did the same and it's done well, originally TF2 was paid for (which the game is being compared with relentlessly). I don't have any fear that it'll kill Overwatch at all.