The new section 'Novels' is for fan-translated novels that some manga are based off of. They will always be put up in MOBI format which is the standard for Amazon Kindle. If you have need for a different format "Calibre E-Book Library" ( http://calibre-ebook.com/) is a brilliant program that not only organizes your E-Books but will also convert them to the format that your particular device requires.
Having a love of books and manga, I read a lot. When I got an E-Reader I tried to find a way to put my manga onto it which led to the making of PDFs.