Buying before VB4 questions

[محروم.كوم]

Hi I have a few questions about buying VB now as VB4 is soon to be released.

1 - If I buy now, do I pay extra for any new features of VB4?
2 - If I buy now and start running VB now, will it be easy to upgrade my VB to VB4 or is VB4 going to be a totally new type of software that will not be able to upgrade from the current VB easily?

3 - Are there any benefits for me to just wait and buy when VB4 is released?

Thanks in anticipation __DEFINE_LIKE_SHARE__