Current proposals:
This is a summation of the more polarizing issues related to RFC format. Many participants in the discussion have dropped off in reaction to the sheer quantity of discussion around these and the other topics. To bring everyone back up to speed, this list the more contentious topics.
Source format, aka Submission format, Input format = the format used by authors, etc., when writing an I-D. Currently: XML (can be uploaded to the I-D submission tool currently), NROFF, .doc, .txt
Canonical format = the authorized, recognized, accepted, official version of the document
Archival format = currently the printed, paper copy AND the digital .txt of the RFC
Output format, Display format = format as it may be read or printed after publication process has completed; currently ASCII, PDF, and HTML are common output or display formats
Pagination
Character encoding - ASCII
Character encoding - UTF-8
Mobile Devices
Use of RFC-specific tools
ASCII art
Graphic art / Advanced diagrams
Equations
Metadata and tagging
Containment
Source Code format