Not a lot of space to work with there.
Based on this photo from TTMG (great stuff as usual), I'm guessing they might shoehorn an extra seat or two in there.
http://ttmg.org/blog/wp-content/uploads/2011/10/Novabus_Nova_LFS-Interior.jpg
They could do the layout in this photo, only have the first three rows (from camera's point of view) of transverse seats on the lower level be singles and have the last row be a double as is done on the lower level of the back portion in the XD60s. Add the solo seat in front of the front wheel on the door-side, and you add up to 34 seats; same as a C40LF.
Also, I'd like for the to go with the white interior window frames and paneling. Not sure if that costs extra or something.