The Russian localized version of Small Basic went live today, as v0.5.1. No other change has been made and all the remaining functionality is the same as v0.5 (including English, French and Spanish). So, if you want Russian, go ahead and download Small Basic from the same location (http://msdn.microsoft.com/en-us/devlabs/cc950524.aspx). As always, please refresh your browser, and clean up the cache if need be to get the new version.
If you're running English version of the Operating System, you can run:
%programfiles%\microsoft\small basic\sb.exe /l:ru-ru
to launch the Russian localized version.