I'm a mobile developer and also a long time fan of Toodledo (just never found anything else as flexible). I've been unhappy with the current apps on my BlackBerry 10 device that support Toodledo, however, so am thinking of writing one myself in my spare time. I would do it using native Cascades, with offline sync.
I wanted to send out a message to gauge possible interest in such a program. I'm hoping that the people that appreciate the flexibility of Toodledo to get work done, are also the same type of people that would gravitate towards the excellent BB10 phones.