So I updated it manually through Huawei's website as the OTA wasn't available.
The phone was very very laggy after the first boot and took some time to become usable and to update some Google apps.
Following are some of the changes I've seen versus KitKat.
- The notification bar is now dark. This is good in some ways and also bad. Good because previously the names of songs when being played on SoundCloud or Play Music were not visible because they were of the same colour as the white background.
It is also bad because now that the screen is black, it isn't visible in direct sunlight because the icons don't have much contrast. Also, you can scroll between the shortcuts.
- The settings panel also changed. The icons now have colour and they aren't flat.