Okay so i was doing my rep dailies after the 4.0.1 patch hit, and noticed sometimes, i got remounted instantly.
I looked into it a bit more and discovered that [as a DK, confirmed to work on mage too] if I cast any buff at self whoever and jump right after that, i get mounted.
I've had a lot of funn killing allies that were trying to fly away [bcos 310% mount + 20% from talents is 372% ]
I searched for this and no, its not a repost
EDIT: Looks like some ppl here fail at maths.
Mount speed modifiers are applied multiplicatively, which means the formula is 310 * 1.2 = 372
and not 310 + 20 = 330.