buying a license
 

I would like to buy a vbulletin license, but I have heard that you are changing it to vb4 .. are all the styles and programs going to be compatible with vb4?
I don't want to buy something that is not going to be compatible with all the older 3.8.+ vbulletin, is there going to be a trial vb4 that I can try or a beta release? Please let me know what is going on with vb as I will go to another community board if vb4 is not going to be compatible with all programs and styles that work with 3.8+.
Thanks Bill