Why is the pace of change on WP so slow?
The biggest problem for Nokia must be the slow pace of Windows Phone development.. Considering Microsoft is the new player, I expected them to be investing heavily and release continuous updates to enable new features. Instead they had to re-engineer the OS from CE to NT kernel, because they ended up in a technological dead end. While this was happening they should have had another team overhauling the front end. It needs things like multiple tile pages, a completely written music player with all the crappy panorama views stripped out, and numerous other small enhancements.
I bought an early WP7 device, full of expectation that the OS would continually evolve with updates, but in reality very little has happened. WP7.5 fixed a lot of pain points in the OS, but WP8 is really just WP7.5 with a new kernel.
Nokia must be doing their nut waiting for the OS to improve, especially as there is a lot of very clever thinking in Windows Phone, it just needs finishing off. It's clean and simple, but a little too clean and simple sometimes.