What seems to have happened is that Tapatalk 1 became Tapatalk 2 & is free. It will probably have ads (so I read). Tapatalk 2 just became Tapatalk Pro and may also have something to do with what it will become when iOS 7 drops. I purchased both versions as I didn't really like tapatalk 1 once 2 came out...it just utilized the full iPhone 5 screen size much better!
Also, the HD version is still paid as most HD versions are separate from their universal or iPhone only counterparts. I don't work for Quoord but have really enjoyed using this app for a few years!