I don't think this has been posted anywhere, which makes me think that it's new info.
There's a reasonably lengthy Stealth excerpt in the rules compendium on the wizards site. http://www.wizards.com/default.asp?x=dnd/insider/compendium
I can't link directly to the article, but just search for Stealth from there.
The changes seem fairly small, but do look like they get rid of some of the bizarre stuff people were trying to do with stealth actions.
There's a reasonably lengthy Stealth excerpt in the rules compendium on the wizards site. http://www.wizards.com/default.asp?x=dnd/insider/compendium
I can't link directly to the article, but just search for Stealth from there.
The changes seem fairly small, but do look like they get rid of some of the bizarre stuff people were trying to do with stealth actions.