There's been a lot of buzz about ME Model's images of workers laying track. They posted an update to the website yesterday.
From the ME Models site:
"By now, there has been a lot of speculation as to what ME Models is coming out with. Some of the answers have been very creative while others have been nearly correct. We've come up with a new photo for your enjoyment and added a few new clues as to our latest concept. I will tell you this...we've moved into Beta 2 with our new creation and as it stands...we will unveil our product line at the end of the month."
While the end of the month is still a few weeks away, there is an active discussion that can be followed until then over on Eurobricks.