I asked this question to the support folks at Pioneer U.S. and here's what I got:
Michael,
Pioneer will not be releasing the CNSD-300FM. The most current one we have is CNSD-200FM.
Thank you,
Stephanie
Parts Sales Representative
Soooo...does that mean we're not getting any more map updates? I'm still running on the original version, and I'm not sure if it's worth $120 for two year old maps on the 200FM update.