If Nokia has to create a Lumia PureView device with that “41 MP sensor“ then it is not possible with the Snapdragon processors, Nokia is currently using in Lumia 920 and others. Not only this even with any other S4 processor, it is not possible as maximum they can support is up to 20/21 MP camera sensors. Coming to even the latest processors from Snapdragon family, there is only one which can do that, the mightiest “Snapdragon 800″. Only, this quad-core processor can support upto 55 MP sensor. Even the Snapdragon 600 which is being used for latest Android flagships like HTC One and SGS 4 can support only till 21 MP.
So, it seems until Nokia finds some way to make it possible somehow with S4 processors, which seems highly unlikely, it has to be Snapdragon 800 all the way. There is one more possibility that if Nokia gets a customized chip from some other manufacturer, which again is highly unlikely as Microsoft has allowed only Snapdragon processors for Windows Phone yet.
So, can you imagine this ? A WP8 Lumia running on quad-core Snapdragon chipset. It will simply blow away every benchmark out there. Dual-core S4 plus processor running Lumia 920′s performance is hard to match for even latest quad-core and octa-core Androids. So, Lumia PureView is a certainly a next generation device for Nokia with Monster camera and Monster performance !!
Keep in mind this is certainly possible if that 41 MP Lumia runs a Snapdragon processor. If, not then Nokia must have found a workaround to avoid using latest processor and knowing Nokia, this is not impossible ;).