I just took a test drive of Windows 8.1 dated last year by MS, so I don't know of additional changes, but the Start button STILL SUX! hahaha
I find the block graphics Very Off putting, and no large improvement as a desktop OS replacement, but it's sure better then the Developer Preview I first played with, that was a nearly empty template of an OS relying on user customization and MS' own Store, and Internet connectivity.
It's no secret being online nearly all the time would be most beneficial for how the OS operates.
Haswell is 4th gen Nehalem so it makes sense perhaps that Broadwell is shrinking in die size. I am among those who invested into first iteration Nehalem, my first PC upgrade to new in a long time, early adopters DO GET BURNED! haha
On another note, I was going to my bank ATM a fortnight ago, and someone was discarding two monitors... again, free computer goodies I could take in, one a large, cumbersome CRT, too old and uninteresting, the other a Samsung 226BW color flatscreen, apparently new in 2007, it's a TN based 22 inch monitor with an apparent history of problems, no surprise, mine (now it is!) suffering similar fate, like the found 47 inch I'm also working on, these will likely be my main new flatscreens once addressed. In the process of repair research, I'm including this for helpful guide to the problems you'd encounter. This is a more long winded explanation then I like to give, or read, but it covers areas I'd be looking at. Even CCFL replacement, which I've done on laptop screens, and most recently, LCD to LED replacement conversions, which worked so well, I plan to do more in the future!