Like a lot of things.
Many do not read the full story.
If you have Windows 8.
To “upgrade” to 8.1 is free.
The reduction in licencing (new OS), is due.
In part to MS & the acquisition of Nokia Windows phone division.
The licence fee that MS charge internally is therefore reduced.
This could also affect other phone manufacturers tendency to release some Windows phones.
Windows 8.1 should be available on (certain) phones form April this year.
N.B. This is likely to affect laptops/tablets etc, at some point.
As for who would pick a Windows phone over Android.
I guess that’s just me then…