It will be in Special Events in the future. Hopefully, soon.
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Keldeo is event-only pokemon. This means that Nintendo will distribute Keldeo for players to catch. The only other way is to cheat with Action replay, gameshark etc.
Keldeo cannot be caught in-game in Pokémon Black and Pokémon White because it's an event-only distribution Pokémon. Currently as of January 22, 2013, Keldeo cannot be received by event in Pokémon Black and Pokémon White; however, you can either opt to trade for one or you can opt to choose a cheating device in order to acquire one.
Keldeo is a Water and Fighting type pokemon.
Yes, Keldeo is a legendary Pokemon.
In Pokémon Black and Pokémon White, you will need to take Keldeo, Cobalion, Terrakion and Virizion with you to the Moor of Icirus. Once you're there, a cutscene will happen that will involve the teaching of Secret Sword to Keldeo.