The new series is slated to start posting online in Sept 2009. Most likely it'll post at a rate of 3 pages a week, since I need to buffer in some time to finish the arc. I think that means the series should wrap up around Spring of 2010, so I imagine I'd be putting the graphic novel collection out at that point.
Interesting idea about making the online stuff B&W to give some incentive to buying a color print volume. I'm hoping color pages online will help make the series attractive to more people though, so I think my B&W days may be behind me. As for incentive to buy the print collection, I always throw in a lot of extra material, and I'm toying with the idea of putting in a new short story as well.