WashPost: 9 changes to the Chicago Manual of Style — and why they matter
"* Prepositions of five or more letters are now capitalized in headlines: Words into Type, but Much Ado About Nothing.
* Overly no longer seems overly weird; you can use it.
* Indigenous joins Black and White in capitalization.
* Look, it’s Halley’s Comet, with a brand-new uppercase “C”!"