I didn't try any beta versions myself, but I've kept a close eye on several forums discussing iOS7 and never saw any other posts about this. How was this overlooked? Do people not use this? Reader was one of Safari's best features, not only for reading, but also for sharing articles with people in a friendly format that could be sent directly in the body of an email message.
In iOS6, we were able to change the theme, font sizes, textured backgrounds, etc. Why on earth would they dumb down this feature?
The only work around I've found so far is to enable "Dynamic Fonts" (Settings --> General --> Accessibility --> Larger Font --> Enable Dynamic..). I can change the size of the font, but can't change the font from aerial.
Brutal.