Well lets see. vB4 was released in December of 2009 and vB5 was released in September 2012, three months short of three years.
So if the same pattern is followed, in June of this year we should see the newest version.
I doubt that though. As the state of vB5 is no where where it should be, and you also have to factor in the cloud, which is running vB5.
I have to believe vB5 has not got no where the sales that were projected for the project, so I doubt they will dump more money into hiring people to start on something new.