The photo below was taken from the set of The Green Lantern, currently filming in Madisonville, Louisiana. It's definitely some kind of spacecraft in a lake, and it very well could be Abin Sur's ship. I understand that this could be one of many spacecrafts, but due to the fact that this is an origin story and Abin Sur plays a big part in the story, giving Hal Jordan his GL ring on his deathbed, it's definitely not out of the question that this is his ship.
Check out the set photo below, and then you can have a look at the ship design from the original comicbook. I think the design of the ship is pretty cool. What do you think?