There are one or two other threads on this very question - I've been wondering the same thing for almost a year, and unfortunately it appears that the answer is "No". It is clearly not a priority for Adobe, which is quite a shame as the DNG format has many other benefits and would otherwise be my first archival choice at the moment.
There is a commercial plugin under development - check out http://www.ardfry.com/dng-codec/Download.htm. There is a free trial available for download; worked well for me but it's expired now. Its only shortcoming seemed to be limited metadata viewing.