No we don't have to down grade to get the firmware update by Samsung and Sprint. Microsoft said we will be able to get all firmware and OS updates. We will have to be patient and wait as Sprint did say it is going out in small sums. On another note,
Sprint expects to get new Windows Phone in the near future! I hope its high end Nokia Lumia devices or High end Windows 10 devices. We already had mid and low end devices.
Don't believe this RUMOR. It's just Sprint's attempt to keep more Windows OS users from leaving. Yeah, if they do get a new Windows OS device it will probably not be a flagship phone and will not be supported. Remember the whole GDR3 debacle with ATIV S Neo? Sorry to be so negative, but I'm DONE.
Could someone enrolled in developer preview program that has received the Sprint update (if anyone) post current software version of: