I think dynasty PPR leagues differ so much on what the 'PPR' rules are that for most of us player rankings will have to be extrapolated from whatever FBG might post, just as they has to now from the basic basic rules rankings. It seems to me that so many PPR leagues now give 2 points to TEs, or .5 to RBs and WRs and 1 to TEs (like my 'PPR' league), or none or .5 to RBs, or something different than a straight 1 per reception that additional rankings wouldn't be that much more useful than the basic list - requiring extrapolation to your own league rules.
Dynasty rankings are already subject to so much individual adjustment before they are very useful, based on what kind of lineup you start, roster depth allowed, league scoring systems ... that they are awfully general by nature. I don't think you get much closer to a useable base to work from creating lists with a point per reception and facing the same huge range of variables. So for dynasty, I would rather the FBG staff members spend their time updating their current dynasty lists than making more lists which would almost certainly all be updated that much less often.