I'm still hoping Jolla and/or Nokia bring back a N900-like device.
I feel like that would come with the territory of a niche, small-batch device. They wouldn't be large enough to benefit from economies of scale, and they're not bringing in enough money to employ teams of engineers to optimize and refresh the hardware regularly.
It wasn't perfect (I seem to remember the battery life wasn't great), but it was a great device, more like a Swiss army knife than a phone. Wish Nokia had done a full release of the N950 (the N9 with a hardware keyboard, only released to developers, with a weaker screen than the N9) as that was shaping up to be even better than the N900.