According to an email received from them -not myself

Dear sir,
Version for Maemo (Nokia N900) is currently under testing and will be available very soon. It is planned in the beggining of next year, probably in the middle of january.
For more information about upcoming releases please join our mailing list at Sygic, car navigation for iPhone, Android, Symbian, Windows Mobile and Linux mobile devices section help.
Thank you for contacting support and your interest in our products!
Best regards,
Sygic, a.s.
Nam. 1. Maja 18
811 03 Bratislava

not this year by looks of it!