Thanks to a very observant reader, we have the first screen of Darth Vader's Tie Advance in action!
A couple of weeks ago, PGC reported in this story that Darth Vader would be a playable character in Rogue Leader. Now we have a screen!

The screen was taken from yesterday's Rogue Leader 2 trailer (so pardon the quality). At about a minute and fifteen seconds into the trailer, you can see a brief clip of footage demonstrating the playable Tie Advance.
You can see that the Tie's wings are shaped like a Tie Bomber's wings, yet it doesn't have the bombing module to the side of the pilot's module. That pretty much confirms it as Darth Vader's prototype Tie from Episide IV.
Special thanks goes to "Bob Da Monkey" for spotting this brief clip in the trailer!