Regardless of the accuracy of these rumours, I'm definitely expecting some improvements to the camera and much more invasive operational location awareness in the
M3, although I doubt DJI will ever get the to point where they prevent you taking off if you can't connect to the 'Net unless forced to by legislation. Far too many people fly in mobile not-spots for that to be practical any time soon, as acknowledged by the UK government inquiries, so if you have a dedicated RC controller phone/tablet that's only ever in flight mode when operating, then other than any localised ADS-B traffic capture and logging you should be fine on the privacy front unless you're particularly obsessive about it. If they can get their digital signing act together they might start coding things so that you can't take off without a valid and reasonably current NFZ database installed though.
As for the inclusion of ADS-B stuff, that's a given, and I fully expect it to be embedded and hardwired to the point disabling it isn't going to be remotely practical for all but a very limited number of people, even if they were inclined. It's going to be a regulatory requirement in many major regions DJI sells to and it's simply going to easier to roll that out globally and be able to demonstrate to applicable regulatory bodies that it's not readily circumventable. Better still, if they can somehow put an ADS-B transmitter in now, even if it's turned off by default, then they're future-proofed; especially given some regions are even discussing making fitting ADS-B retrospective (and yes, that demonstrates a complete failure to grasp the practicailities of doing so). Personally, I think DJI is all over that not just because they know it's inevitable, but because they've been proactive about it and know it's an area they are ahead of their competition on. It doesn't matter how many tariffs there are on Chinese goods if the law says you need a given function installed and the Chinese product is the only game in town - you either pay the surcharge or you don't get to play (legally, at least).
On the sensor front, the
M2P was DJI's first Hasselblad branded model and they've had some useful (and not so useful) feedback on that now, so should have developed the sensor and supporting circuitry accordingly. Factor in the continued uncertainty over what they have planned for the Phantom line and I don't think positioning the Mavic line as a general purpose creative photography tool and pushing surveyors and other professional photographic users towards the Inspire and potential "RTK" style Phantoms optimised for that kind of work is too far-fetched.