@viktor actually we do now have a coding standard for Plugins/Themes approval, and the core is anyway following coding WPCS standard (mostly) and a number of other standards which are way more advanced than PSR_x standards.
We should either close or mark as done I think, so folks do not waste votes on it.
There is a branch for the big PHP coding standards changeset. The build does run the coding standard checks, but a lot of them fail until that changeset gets merged.
WP added a JS coding standard, but hasn’t made all the existing JS match it. I don’t think having the same standard for PHP and JS is optimal, or what the petition is asking for.
I think the petition should be closed.