I am almost sure that Lumia 650, 750 and 850 would have Snapdragon 410 and 615 processors (processors made on 28 nm LP node manufacturing process making them very throttling and heating ones, are well over 1 year old)
inside them as per price range, processors that have heating issues and not so well graphics performance and only have the advantage of being 64 bit over their 32 bit predecessors.
Next year Android phones are going to contain Snapdragon 415 1.4 Ghz Octa-core( made on 28 nm LP node) Snapdragon 618, 620( which are made on 28 nm HPm process, the same manufacturing node used by previous high end snapdragon 800 series processors till Snapdragon 805) and Android Marshmallow in Mid-range prices varying from 200 US $ to almost 450 US $.
I hope that Microsoft would soon announce support for New SOCs ( Snapdragon 415, 617, 618, 620 as these processors are not still supported by Windows 10 mobile) and would use them in Lumia upcoming mid range Smartphones. But, that's only I can hope. But, if Microsoft would use old Snapdragon 410 and 615 processors in upcoming Lumia 650, 750 and 850, I bet that their performance won't be much better than their 2015 Android counterpart smartphones, let alone 2016 Android counterpart smartphones.
Let's hope for upcoming Lumias with Latest SOCs, I am also trying to buy a new mid range Lumia but the SOCs suck and the quality and design of them is not much better, even Android phones in such price range have better design and quality. Hope, Microsoft is serious about bringing best new designs for Lumias, and significantly improve the build quality of Lumias and their components.