If you missed the news, Microsoft has on multiple occasions promised [2] (and marketed [3] their devices with it) that WP8 devices would get upgraded to W10M in the future.

Now, I'm interested in two things. First, what does it make you think about MS (if anything at all) and second, what reason (other than "planned obsolescence) is there for this? Surely it's not lack of performance when devices such as 925, 920 and 1020 were excluded, while something like Lumia 430 gets it right away. What could be the technical reason?

[1] http://windows.microsoft.com/en-us/windows/preview-supported-phones [2]https://twitter.com/lumia/status/532128314467823616 [3]http://i.imgur.com/gRIJkWt.jpg