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Nokia last year filed a trademark for its line up “The X-series and C-series”.

Xseries – X6 & X3(Known)

Cseries-C5 & C3(Rumored)

Details

Nokia C3 (Model: C3-00; Type: RM-614)
- RF specs: Quadband GSM, WLAN, Bluetooth
Nokia C5 (Model: C5-00; Type: RM-645)
- RF specs: Quadband GSM, UMTS + HSDPA/HSUPA, Bluetooth

(via:fonearena)