The dual-licensing nature of the Ruby license has always meant that you could distribute it in a BSD-like fashion (with an extra restriction on naming). They simply moved the "or" part of the license from GPL to BSD. Ruby was never distributed in a GPL-like-only fashion. The changeover is mostly a non-issue.
> License of Ruby (#Ruby)
> This is a free software license, compatible with the GPL via an explicit dual-licensing clause.