Ok I've downloaded bikestore quickstart. Install it and then Update VM to latest 2.0.22c version and in fact in VM admin settings there is set our template for VirtueMart default one. Looks like they change the way how template is displayed and the solution is set this option to default Joomla! one. The VM is working fine and even VM changelogs all is described as not feature changes but bug fixes (not in layouts). When the settings are set to use default J! template all is working fine and our override views looks properly.
According to VM updates, the core version is 2.0.22 and we usually update VM to main version not to a,b,c,d,e,f like they want to name their component. If you look at VirtueMart update you will see interesting message http://d.pr/i/v6eA that it is not recommended to use different version 2.0.22a for multilanguage websites (this version is latest supported by our templates). So what we should do right now ? Release two different versions of every store template for multilanguage and single language websites ? It is really pointless...
What is more VM Update will NOT change the VirtueMart settings so the only solution right now is to advise users to apply this change in VM configuration - we don't have any way to change this during template upgrade process.