Why Are There Plans For A BlackBerry Curve 8980?

Could someone please explain to me for what possible reason Research in Motion has submitted plans for the BlackBerry Curve 8980, yet another underpowered, BlackBerry OS 5 running, looks like every other Curve looking, BlackBerry Curve?  I cannot for the life of me figure this out….  I know that the BlackBerry Curve line is the best selling line of BlackBerry devices ever, but, how many times is RIM going to reincarnate this puppy?

For those not sure what I am ranting about, the FCC has released documents and photos detailing a new, unannounced, BlackBerry device, the Curve 8980, which has quad-band GSM/EDGE radios in addition to Bluetooth and 802.11b/g/n Wi-Fi.  The BlackBerry Curve 8980 also has a 3.2 megapixel camera with flash, optical trackpad, and 3.5mm headset jack and will ship with BlackBerry OS 5.

[Via PhoneScope]