Because somebody spilled them! Ok well not really but if you want to hear R Borg talk about when they playtested and developed battlelore and possibly have a few insights as to what may be coming out then listen to this podcast
http://www.pulpgamer.com/insidetrack/134183/pgit-061-richard-borg/
Highlights include
Something about a green dragon (Dragons DRAGONS DRAAAGOOONS!!!!!!!11eleven)
More fantasy races were developed and tested