It will mostlikly be gone when you reboot. I had the movies in the market for a few daysafter the tw update then it disaperied.
I have a thread about it and another person has had it happen as well.
Im not sure its actually a new market...they just opened up access to the movie tab. I definitely didnt install anythingnew. Ive now got it also and i rebooted a couple times to make sure it was staying.