That means you are going to get EAD approved soon... in this week sure!!!.
Congrats... I had LUD:07/22/07 on my I140 which was approved way back in 2005 and I got my EAD approved on 08/1/2007. LUD on previously approved I 140 is very common , they will verify I-140 before they approve EAD, Dont get supprised seeing your LUD next time before GC approval.
Then you may recieve GC soon. My friend's I 140 had LUD (09/2006) on previously approved i-140 (03/2003) and he got his GC(09/2006) after a week. I am just guessing .... Take it easy and enjoy.....