Nokia has filed trademark applications for two new mysterious lines of phones: the C-Series and X-Series.
There's no word on what type of phones the new ranges will be used for, but it seems likely that at least one of them will be for the rumoured Nokia netbooks / mobile internet devices.
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The N-series name is already used for Nokia's internet tablets, but that also extends to its flagship mobile phones, so it's possible the standalone device line could be getting its own branding.
Nokia's history of re-branding devices is noted, with the business E-series and 'four digit' range used for all the rest (with a bit of XpressMusic thrown in for funsies).
But it's perfectly feasible that the new X-Series could represent a new range of media-friendly mid-range phones, giving a new identity to the 5800 XpressMusic style of phones.