The relevant part seems to be:

Wiley-Blackwell will support our authors by posting the accepted version of articles by NIH grant-holders to PubMed Central upon acceptance by the journal. The accepted version is the version that incorporates all amendments made during peer review, but prior to the publisher’s copy-editing and typesetting. This accepted version will be made publicly available 12 months after publication. The NIH mandate applies to all articles based on research that has been wholly or partially funded by the NIH and that are accepted for publication on or after April 7, 2008.

So it seems that NIH-funded articles will appear in an Open-Access outlet, but 12 months after publication.  I don’t know all of the details of the NIH rules, but this does seem a step in the right direction.