Which 3rd parties will have windows 10 phones

[WPCentral Question]

Will HTC, SAMSUNG, etc provide their phones with Windows 10 OS? I would like a choice of which one to buy.

Also, when should they be available to purchase? I know FALL was mentioned but has MS given a better time frame?

I will be moving from iPhone to windows OS but hope to find a better $$ than I expect the 950 to be.