@undoIT: you can support CB financially by subscribing to the documentation service (see
www.joomlapolis.com/content/view/2542/37/) or (if 25 euros is too much or not enough) you can PM me and I will reply with the project paypal account.
@SIGHUP: I am pretty sure existing captcha plugin as well as CB 1.1 need legacy support. However, as soon as CB 1.2 is released there will be native versions of all CB Team released plugins.