CB 2.x is an upgrade to CB 1.x. However, you're way behind on information if you're just discovering this. First steps are to backup your site, clone it, install CB 2.x, update all your CB plugins as needed, then test that everything behaves as expect and get familiar with the UI improvements and feature changes. I suggest going through our News articles found below for various postings we've made about progress and changes.
www.joomlapolis.com/news
For CB 2.x plugin updates please see our compatibility chart below.
www.joomlapolis.com/cb-20-addon-status
Nick has also put together several great videos for various CB usages, which may be of help to you during your upgrade.
www.youtube.com/playlist?list=PLp0puRITgC7PuyzPsMUECDI46VE7IFSAX
CB 2.x is only compatible with Joomla 2.x and Joomla 3.x though so if you're on Joomla 1.x you'll need to migrate Joomla first.