And this has just been proven to be untrue.
https://forums.macrumors.com/threads/1604779/
So the current rMBPs will still support 4K just fine. Via HDMI no less.
Alternatively, good ol' dual-link DVI doesn't fail either. In fact... here's the rMBP (pre-Haswell) powering a 4K display:
http://www.youtube.com/watch?v=OfBd5q_OZ7Q
Big difference under Haswell is it runs much quieter and much cooler. I just played the Sims 3 for about an hour on my lap, with only a little warmth towards the back left (where the power connecter is) and no fan.
They might be able to run some 4k monitors, but that doesn't mean they're supported by Apple. From their website, "Dual display and video mirroring: Simultaneously supports full native resolution on the built-in display and up to 2560 by 1600 pixels on up to two external displays, in millions of colours"
lol if anybody complains about the current rMBP noise level at full fan speed, they don't deserve to have a computer. They're very quiet compared to any windows laptop i've heard.
I think with those expectations you'd be in for a disappointment with Broadwell
- touchscreen
very unlikely unless they somehow change the design to make a hybrid and add a lot more touch features to OSX which doesn't seem they have any plans of doing yet.
- faster usb 3.0
probably but not much
- tb2
give you that
- better quality display
hm.
- much faster dgpu
Seems doubtful there will be any at all.
- much faster igpu
40% according to Intel's plans. Not really a game changer.
- much faster cpu (6 cores)
Intel isn't planning on anything past 4 cores on mobil. They only plan on lowering TDPs.
- even better battery life
that will be the big thing for high end notebooks with Broadwell
- siri integrated
just software, we could have that now if they cared to.
- faster ssd
what would be the point
- cheaper
that would be nice.
You should really wait for Skylake there is way less known and you can phantasize way more about it. Skylake will be the one to have. It probably will be extra lightweight because they will attach a hellium filled balloon to the notebook to lower weight. Apple has that idea patented I think. They will pull that one out to fit the theme of the "Sky"lake Intel chips.