Burning an ISO is simple. When the wizard comes up, just click on New Data CD. That will bring you to the main window. All you have to do is pop an empty disc in your drive, then go to File -> Write Disc from ISO File... That will give you a little dialog where you can choose the ISO file to burn.
As for Flo, well, maybe she's (I think it's a she. I know a Flo and she's a she. Correct me if I'm wrong, Flo) busy. It's been a long time since we had any news about the new version so maybe the CDBXPP team is really plugging into it.
Can't wait to see the next stable release.