Erm... new discoveries are made on a daily basis. The best way to pick them up is to join one of the listservs for archaeology.
Aztlan is probably the one you want. It's open to anybody and you will see amateurs and scholars chiming in. It's not strictly Mayan, and not all
of it is in English. But perhaps it will give you a starting point.
listserv.linguistlist.org...
I can recommend other sources if you like.

