Hopefully the WP10 version of the Preview includes firmware support.
One thing to consider though,if this is a Preview like the Desktop preview you might want to exercise some caution before putting it on your device. Those builds don't seem nearly as reliable as the betas we have had in the past.
Edit: Though I guess they have the whole 'ring' concept on the desktop side
I was thinking about the need for there to be a new preview app the other day (considering there's already one that works perfectly well), I came up with 2 possible reasons:
- it's to unite the phone preview with the existing Windows Insider stuff and move away from calling it developer preview when everyone knows perfectly well that it's nothing to do with developers in reality
- a change in approach meaning that firmware updates are now also included.
I find number 1 far more likely and I'd be a bit surprised if they released fw updates via the Insider channel too, considering the significantly higher chance of new firmware breaking/bricking devices/potentially cause more serious problems than OS updates.
It would be nice, but I think I'd only try it on a second device rather than a main driver.
The ring thing could work well though, if you can specify that you only want OS but no FW previews, for instance.