that's a not-so-subtle hint.
the preview on the WotC site suggested that the 5 lords from BoVD (well, at least Orcus and Demogorgon) are likely to have been re-statted for FC1, which is just as well since the change from 3.0 to 3.5 happened not long after BoVD was printed.
that leaves us with an additional 9 lords with stats... wonder who they are?
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
from James's posts above, it should not be hard to infer that the lords from the Demonomicon articles will not have their stats reprinted in the book, so the remaining 9 will be other demon lords...
and i suspect that the chapter on demon lords will be something to the effect of "14 statted lords" "several paragraphs regarding a number of other well-known lords" and finally "a section of quick notes about the rest of the known lords"?