A new Apple iOS software update includes additional iBooks fonts: "iBooks now features an improved selection of fonts, including Athelas, Charter, Iowa, and Seravek."
http://www.appleinsider.com/articles/11/12/07/apple_adds_night_reading_t...
Typophile
More fonts added to iBooks
Sadly, nothing with Cyrillic support.
We are stuck with Georgia.
Captured from web.archive.org on 15 Feb 2013. view this capture