As far as I recall, that "final" draft of the XHTML 2.0 that W3 posted is "post-schism" just to get something out to compete with the growing momentum of HTML5 and kick the semantic can down the road again to XHTML 3.0 (after most of the damage of the schism was already done). I recall early XHTML 2 drafts had at least article, aside, section, hgroup, and others. I don't know where you would track down such drafts other than combing ancient mailing list archives.