Simply put: no, we're just allowed to use existing TMs unless we claim ownership.
With the Maemo Brand Agreement that Nokia and Hildon Foundation have signed, all TM rights were transferred. But that's just an internal agreement. Officially, things remain as is in the registers.

What matters is that the brand is protected (until 2023 in Canada), even if we don't claim ownership.
Start saving pennys for that now... hmm, I guess by then most of us will be using other gadgets. Who knows... but if not, I still believe the money would be better spent for EU-renewal 2025. That's all we need, if any.