I've added a separate R/qtl2 discussion group:
https://groups.google.com/d/forum/rqtl2-discIf you're interested in R/qtl2, please join that group, and please direct questions/discussion about R/qtl2 to that group.
I'll use this rqtl-announce group for announcements about both R/qtl and R/qtl2, and announcements will be cross-posted to the relevant discussion groups, so you don't need to join both the discussion groups and the announcement group.
karl