They run a customized version of the Standard Android and do not have standard Google Play services.
As many as 75% of Android apps are supported and compatible AND 25 % are not.
SO,If you are an Android Developer and you are very much interested in developing apps, download the Nokia X Services SDK and start developing and help develop the OS.
Nokia takes its new move very seriously. The entire user interface of the devices are retouched and the fast-lane gives you an Asha like feeling.
The searching of apps works like this – say you search for an app in the Nokia Store and its not found, the search is then taken over by a pre-installed third party app and the same keywords are put in automatically and if the app is available, the search returns or else you get a null element.