RDFa 1.1 and the future of RDFa 1.0

Hi,

With RDFa 1.1 around the corner, is it safe to ship new applications (such
as Drupal 7) with RDFa 1.0, or should we migrate to RDFa 1.1? Will RDFa
parsers still understand RDFa 1.0 in say two years from now? (Note that the
page templates included in Drupal 7 are all XHTML).

Is there any document listing the difference and/or benefits between RDFa
1.0 and RDF 1.1?

Steph.