User blog comment:Rupert Giles/Layout Changes: Breakpoints and Typography/@comment-5454372-20150519115226

A somewhat impractical workaround to try guys:

Checking the linked help page showed that if we wanted to preview the current typography before today, we needed to paste  after a page URL.

Apparently, doing this also has some kind of effect:

?oasisbreakpoints=1&oasistypography=0

Not sure if it's identical to how it looked before, but it might be a useful temporary measure if you've got any long pages to read right now.