No, unless you order it that way as a Shop Floor Custom, or flip the stock magnet and flip the hot and ground. There is an issue with the diagram in the blog post, however, which was corrected in a forum post (it was my original blog post).
Humbuckers are all normal, standard if stock. Like Mincer says, you have to do a 'custom' order to get RWRP with a humbucker.
AFAIK the only Duncans that are RW/RP are single coils which are noted as such. (I think the ones that are not are all the recreations of vintage Fender singles, like the Jimi Hendrix set, Antiquities, though Ants are now available with RWRP also - they weren't when first introduced.)
No, unless you order it that way as a Shop Floor Custom, or flip the stock magnet and flip the hot and ground. There is an issue with the diagram in the blog post, however, which was corrected in a forum post (it was my original blog post).