As of last patch, using Iceblock, the 'log-out' float trick or DI in mid-air now causes you to fall to the ground. You used to stay in mid-air (ie if you were to Iceblock while falling, while under the effect of Iceblock you would stop in mid-air and float until it was cancelled or it ran out).
The same is for Divine Intervention; I tried to cast this on a mate who was falling through the air so he'd stop above Halaar and could just /dance for 3 min, but he fell to the ground under it's effects and got priest dispelled. So my exploit is for Divine Intervention, and not Iceblock (Sorry for misleading, I just had to explain myself).
H'ok;
Step 1 - Your target must be on a flying mount
Step 2 - Cast Divine Intervention while he/she is on his/her flying mount still.
Step 3 - While he/she is under the effects of Divine Intervention, get him/her to right click on the flying mount buff.
Step 4 - Voila! Floating in mid-air just like last patch!
Here is a picture