TapaTalk 4 Private Beta
If you have purchased Tapatalk HD from the Play Store Here
and have registered as a TapaTalk User with HD (Note this is a different registration than a TapaTalk forum member, but you may elect to use the same email and password that you used as a forum member), then you are eligible to install and activate the private beta. You may also participate if you have VIP status showing in TapaTalk 2. Download Link
The download link for the private beta can be found Here
at the TapaTalk Forum and there is a promised Public Beta due sometime in May. Information
From the information, that I have seen on the TapaTalk forum TapaTalk 4 will unify the TapaTalk program into one version for phones and tablets running Android 4.0 and above. We do not have any pricing information, at this time, but my guess is that TapaTalk will be a free upgrade from TapaTalk HD and paid from TapaTalk 2. The private beta is far from complete, but it looks very promising and I like the direction that the new version is headed.Work Around
If you can't wait to get your hands on the beta and don't want to purchase TapaTalk HD to participate, I have seen some users take the route where they purchase HD, registered, and then return it to Google Play within the 15 minute grace period. You would be able to try out the beta, but obviously you would not qualify for the free upgrade, if and when it is made available.