Since Episode 0 of the Odd World News Podcast, I have been using MP3s as the file format. With the release of Overcast 2.0 and its support for chapters, I have now changed over to using M4A files. M4A files will allow for enhanced podcasts, which will include the ability for chapters.
Starting with episode 43, which is available now, Chapters will be enabled. Alongside chapters, I have also begun adding the episode number and title to the artwork. There is nothing you have to do to get the new enhancements, the new enhanced will automatically be in the podcast feed.
If there are any questions or problems feel free to email us at oddworldnewspodcast [at] gmail [dot] com.