rc2 makes one small but significant change: a required property format at the top level of metadata.json that takes the fixed value scripture burrito.
{
"format": "scripture burrito",
"meta": {
"version": "1.0.0-rc2",
"category": "source",
...
This was added to provide an easy way to test whether something (a directory, zip-file, lone JSON file) is a scripture burrito or not.
Assuming no further issues are raised, this release will eventually become 1.0.0.