Here is the schedule, based on a couple is 3.
March 5th: ToT opens.
March 12th: Heroic Mode is available.
March 26th: ToT first wing in LFR opens.
April 16th: ToT second wing in LFR opens.
May 7th: ToT third wing in LFR opens.
May 28th: ToT final wing in LFR opens.
source: http://us.battle.net/wow/en/forum/to...8989830?page=1
QQ or Happy to see baddie QQ?