Check out http://www.wowwiki.com.
Searching there for Twilight Grove gave me
this. Seems it's a portal to the Emerald Dream, which is not accessible currently.
Doesn't say too much about the SW Mage Quarter's portal, though... just mentions that it exists. Hmm...
Edited, Dec 22nd 2006 12:00am by Rykhorne Edited, Dec 22nd 2006 12:01am by Rykhorne