Yes, feels in the first moment like a new competitor which could mug away developers from the maemo platform. But after a short moment it looks in my opinion more like a big chance for our community.

Speaking for myself, the rumored Meltemi platform looks currently not very attractive to use it myself as a daily device. And I won't develop for a device which I will not use myself. But if BlackBerry is doing it right I will get in the end a N9 or even better a N950 successor, sadly without terminal, but perhaps still attractive enought to use it as my daily device.
Since it supports Qt, qml and now first successful tries to get python on it running the Qt BB10 apps will get easily portable back and forth to BB10, N9 and later Meltemi. BB10 Devices are currently not available, but our N9 are.

So, attend now our coding competition! The future for your Qt stuff looks currently very bright!