I'm still using Windows 7 so you are comparing the wrong OS for me.
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As long as MS doesn't do a 180° on stuff like privacy, features, advertisement on the OS and forced updates I won't touch Windows 10, period.
This is the reason why I'm looking forward to the MBP I don't want a Touchscreen but I want a UHD resolution based NB that allows me to install Windows 7 and I'm sure the new MBP will fly through it as would the 2016 dell but you can't that thing with highend resolution and NO touchscreen.
Ah. You should've said from the beginning you're comparing to Windows 7.
BTW considering my problems with rMBP late-2013, you might have problems with Windows 7 on new rMBP and they may even be quite unsolvable. Depends on your view on certain things.
1. It will likely have NVMe SSD and original Windows 7 SP1 ISO does have problems dealing with it. On the other hand Apple will likely not include anything that might help with it in BootCamp. You will likely have to create custom ISO to install Windows 7 because you will not be able to put them in during the installation like it's advised to do (see next point).
2. It will likely have USB 3.0 or 3.1 and original Windows 7 SP1 ISO does have problems dealing with it so internal keyboard, trackpad and all USB ports won't work initially. You will likely have to create custom ISO to install Windows 7 (see next point).
3. rMBP late 2013 refused to boot straight from Windows 7 USB. You had to make BootCamp bless the legacy mode on USB first in order to boot from it on next reboot. I've tried all possible combinations of command line utility bless and was unable to replicate what BootCamp does. I. e. I was unable to boot Windows 7 from install USB without BootCamp support. And Apple might strip this support since Windows 7 is no longer deemed supported.
4. Apple might fully remove legacy boot mode from new rMBPs and you won't be able to install Windows 7 at all as it works quite bad in EFI mode on Macs. All things point here.
5. Even if it does not, you would prefer to have a model without discrete graphics, otherwise this will be the only graphics card you'll see in Windows - switching between Intel iGPU and dGPU does not work in Windows on Macs. Battery is only sufficient for several hours with it. And any small load (like casting a tab from Chrome to TV) makes the fans go nuts.
6. If you're OK with small fonts then the following is not a problem for you. Windows 7 is bad with font scaling. Scaling up to 150% works quite ok but on rMBP 15" the fonts are still unbelievably small. If new rMBP has even better resolution, the problem will become worse. Scaling 200% gives you right font size (like default scaling for Retina in OS X) but for unknown to me reason it breaks many other things compared to 150%.
7. Setting up two times lower resolution and leaving font scaling at 100% won't help either - for unknown reason everything is very blurry even though two times resolution means just use 4 physical pixels where you've used 1. It should not affect it this way IMHO.
8. And one more minor drawback - boot times will be longer as Windows 7 boots in non-EFI legacy mode compared to Windows 10.
Windows 10 solves all of these problems.
I'm not trying to frighten you. It's just my experience, I've MBP 15" late-2011 and rMBP 15" late-2013 currently with Windows 7 installed (and rMBP 15" mid-2015 with OS X). And when I installed Windows 7 on rMBP 15" late-2013 I was quite sad Apple does not sell cMBPs with up-to-date internals but FullHD display.
If you can lay your hands on some rMBP 15" with Retina display, I'd advise you try installing Windows 7 on it before you buy or even wait for new rMBP. Otherwise you might be quite unpleased when you buy it after long wait and face hard choices (live with far from perfect Windows 7 or migrate to awful Windows 10 or migrate to not less awful IMHO macOS or return it and understand that waiting time was for nothing).
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The haswell chip was a drop-in replacement for the broadwell
I think you mean vice versa.