After many complaints about the new rogue stealth animations, Blizzard posted the following:

We have just received some feedback from the developers regarding this issue and it is good news indeed :-)

The animators are currently working on completely new stealth movement animations to solve this issue. This basically means that the current "funny looking" stealth animations will be replaced with new better looking ones :-)

Currently this issue is expected to be resolved in patch 2.1, but there is a chance that the new animations will not be ready by that time, which may result in the fix being delayed for a later patch.

Have some comments on this? Feel free to let Blizzard know in the following thread: Blizzard - Give Back Old Stealth.