A few weeks ago I got an email saying I was one of the last two PG contributors using RST and that RST would no longer be accepted by PG. It was suggested that if I wanted to use RST I could convert it to HTML using pandoc.
I have been experimenting with pandoc and rst2html and have gotten good results with both, so I have a pretty good procedure going where I can make RST files and generate usable HTML files from them. I think rst2html gives better results than pandoc, but both work OK and I don't miss the PG extensions to RST much if at all.
HOWEVER, I am not entirely clear on how to submit my HTML docs now. The ebookmaker page suggests that I can include metadata in my HTML files and ebookmaker will pick it up. That does not seem to be happening.
My HTML metadata looks like this: