I want to build a new store. When roughly will be released the final version 3?
FFS. VM3 is already being used on http://extensions.virtuemart.net/ and if you want to speed up the process of making it available for all then download the latest dev version 2.9.8a from http://dev.virtuemart.net/projects/virtuemart/files and try using it. Please read http://virtuemart.net/news/latest-news/460-updates-about-virtuemart-3-support-membership