World Of Warcraft New ULDUAR Trailer!

Ulduar is a new Raid Instance featuring 14 new bosses, 800 new items, Tier 8 armor sets, and hundreds of achievements! Also; there isn't any official confirmation yet but the patch is now available on Blizzard download servers and it's only a matter of hours before we see a message from them.

But this is quoted by Zarhym from Blizzard;
We will be performing extended maintenance on the below realms beginning at 1:00 a.m. PDT, April 14. Maintenance for all US and Oceanic realms not listed below will begin at 3:00 a.m. PDT, April 14. We expect all realms to be playable again by approximately 11:00 a.m. PDT.

Also The Argent Tournament
The Argent Tournament is a new world event in Patch 3.1. It takes place at the north of Sindragosa's Fall in Icecrown in an area controlled by the Argent Crusade, a new colosseum is being built here and will be complete in a later patch (most probably in 3.2).
Your goal in the Argent Tournament is to become the champion of a race. Only your own race is available when you start questing in the zone and you have to complete enough quests to become its champion. After that, you will be free to quest for any other race of your faction. Every time you become the champion of a race, you unlock the pet / mounts / tabards / banners rewards for it. (You can't talk to other races quartermaster if you haven't started running quests for them yet)

There we go! Patch 3.1 is live 14/04/09 ! Have fun guys!