True, but how could lenovo butcher cpu performane AND battery? With a fan included, which apparently isnt needed, yet still thermally throttle? Core m, is just that. It will never be a core u. Which is why sp4 will include core u broadwell
Edit:
I say how could Lenovo butcher 'both' CPU performance AND battery?
By that, I mean that CPU low/medium/high performance is pretty much set on the CPU die itself. Manufactures like Intel make these chips, and the exact chip is only capable of so much. Then computer manufactures, can take that chip and severely limit performance to gain best battery (like battery saver mode), slightly limit performance to gain slight better battery (balanced), or give top performance with limit to battery (high performance). With that said, Lenovo as a company, cannot limit performance and while providing horrible battery. That's the chipset itself.
If you look up all the Lenovo yoga 3 pro reviews, its been found that the core m Y3P offers a good sized performance hit compared to even the i5 u. And reviewers found that the Y2P with i5/i7 actually offered better battery. Other than a few tweaks and improving the panel (which is still 3k in both), the move (other than cosmetic) from Y2P with HASWELL to Y3P with BROADWELL decreased performance and battery. Other than being slimmer, lighter, and less yellow accuracy issues with the screen, the Y3P offers downgrades in every actual category in regards to chipset.
I really hope that Microsoft wasn't planning this BROADWELL 'upgrade' to M. And if so, I hope they learned quick what Lenovo showed to the world, that BROADWELL M is an upgrade to HASWELL M, it isn't any sort of a upgrade to HASWELL U, and is actually a downgrade.
Both CPU and GPU are severely limited in stock clocks, but 'promised' higher/similar turbo clocks. Yet even fan cooled, is thermally throttled worse than HASWELL, and never sustains turbo clocks for any significant period of time. Thus operating at the drastically lower stock clocks for the majority of the time.
The above sentence makes a huge statement towards BROADWELL M being put into a surface pro. As thermal throttling is HUGE with current HASWELL in surface pro. While with other manufactures not so much as SP 3 went slim while others are thicker and allow better cooling. And if a still thicker laptop with a fan has horrible thermal throttling with a BROADWELL M, I can't imagine AT ALL, that not being a problem if put into a surface pro.
Thus, my main point and main thought. Is that if surface pro 4 was released with a BROADWELL M, it wouldn't be an upgrade or offer anything more than I have now with a surface pro 3. And, from what we know about BROADWELL M now, it wouldn't even be a side grade. It'd be a honest downright downgrade to the surface pro 3. With surface pro 3 selling so well, and finally getting Microsoft some numbers on the board, I really REALLY hope they don't make the move to m. If so, it could easily and sadly, turn out to be the nail in the coffin for surface pro. I don't think Microsoft can take any more hits on the surface line, and if BROADWELL M turns out to be for the surface pro 4 what it is/was for the Yoga 3 Pro, it would flat line surface pro sales, ruin what momentum the surface pro 3 gave Microsoft, and cripple trust/expectations of the surface pro line and easily kill it off.