Here's another article posted by Mashable:
"The web is abuzz with news of a leaked script from Summit Entertainment’s The Twilight Saga: Eclipse, which is scheduled to land in theaters in June 2010.

However, before you get too excited about the script (which probably won’t be too different from the book, anyway), it’s time for a reality check, thanks to the always knowledgeable Nikki Finke.
Last night an alleged copy of the Eclipse script was leaked to the Internet. The script was watermarked with the name Jackson Rathbone — the actor who plays Jasper Hale in the franchise.
PopCrunch cites Summit Entertainment (in a comment to MTV News) as responding:

“There is absolutely no merit to this claim. We noticed it over the holiday on multiple message boards and sites, and it appears that some of this was spam.”

Nikki Finke wouldn’t call the script spam — she says that the leaked script is real and did belong to Rathbone. However, it wasn’t the shooting script, but an earlier draft. So if you were expecting to find specific shooting directions for R-Patz and K-Stew, think again.
Frankly, considering that Eclipse is based on a book, and because the series has remained relatively faithful to those books (from what we hear, anyway), it’s doubtful that there would be any earth-shattering revelations in any script leak.
In the interest of Internet security, we do suggest being careful before downloading any file purporting to be the leaked script. Nikki Finke reported that this was a leaked PDF file, while other sites have said that a Word file is floating around. The potential for malware authors to take advantage of the situation is pretty strong, so be careful!"

We've got a few hints on what to expect from Eclipse movie!! Thanks to Mashable!