Awesome news. Thrasher's a pain to play sometimes, but it's definitely always good for a challenge.
It's also cool that you're doing the charting yourself. Is this the first known instance of a band with regular DLC in the game doing their own charting for RBN?
Also, any plans to post preview videos of the charts? I'd love to see what these are going to look like (and find out whether I should anticipate them being as brutal as Thrasher or not).