Does Microsoft will release Windows 10 desktop and for phones at the same time? Which mean that when Windows 10 rtm is ready, does the phone version as well?
I can almost guarantee that won't happen. Didn't happen till now (for both 8 and 8.1), but they are working towards an 'almost at the same time' release.
I expect W10 for Phones a few months after W10.
The question came to my mind because Microsoft has been preaching one OS for all devices. This is not the same approach as WP 8.1. They are trying to unite all devices into one OS.