According to PalmInfocenter, Palm may be releasing a Tungsten C in March:
Highly speculative rumors from the PalmInfocenter forums, claim it may resemble the Tungsten W with a built in thumboard with integrated WiFi (802.11b) instead of a GSM/GPRS radio.
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Another theory is that the “C” could possibly stand for Camera, or any number of other things. That would support this rumored device which was submitted anonymously back in November. Speculation on that device ranged from a possible Smartphone to a tablet like handheld. […]
It’s very characteristic of Palm to drop the price on their high-end model before announcing a new one (which they did earlier this month), and PalmInfocenter rumors have been reliable in the past.
So, there’s little doubt in my mind that a Tunsten C will likely be released in March. What its gizmo will be (802.11b, digicam, or otherwise), I can’t be sure. Personally, I’m rooting for 802.11b as that would allow for cradle-free hotsyncing and — even better — mobile e-mail access such as in airports or coffee shops.