They’ve released a cinematic trailer too, with the Heroes of the Storm website dropping more details on their new champion.
In a nutshell, Samuro is an Assassin type, with the Advancing Strikes hero trait. Said trait means basic attacks against his enemies will increase his movement speed by 25% for 2 seconds. His Bladestorm heroic on the other hand deals 285 dps for 4 seconds to nearby enemies, with his Illusion Master heroic lets him take control of mirror images of himself or switch places with them.
Either way, for a look at the full gamut of his abilities, hit his hero page here and don’t forget to check out the cinematic below!