On the New Games page, if you filter by Xbox 360, the XBLM games don't show up. But there is no tab for XBLM, so there's no way to see just those. Seems like one of those two options should be supported. The same seems to be true of PS3 and others. Not a big deal, just wanted to report it.
I enjoyed Arcania as much as the previous Gothic games, although it was very easy to tell it was a different developer. I'm curious if you've played Risen -- it's effectively Gothic 4 in all but name and lore, made by the original Gothic developer.
I don't really care about this game, but I've gained major respect for Gearbox for letting the fans have their time doing this. It's a win-win-win as far as I'm concerned -- for the fans, modders, and the company.