Same performance as rMBP 15" but less weight

1kg with the performance of a 2014 15"?
No way. It doesn't seem possible to me.

 

You are asking for the weight of the current 15" to be cut in half yet still have the same power.

 

have to be a good ten years away from that

 

the biggest problems I've noticed with PCs is that YES they tout an amazing amount of power but their lack of being able to adequately translate that power to synergistically working is the PCs downfall. Macs run slightly behind in busting out the latest and greatest but when they do they do it right.

 

No.
It would overheat and the battery would last about half an hour.

Nobody knows the specs, whether it is ARM or Intel based or if it is even going to exist, but its a pretty safe bet that they're not going to pack a rMBP 15" into it. Most likely, ARM-based and unlikely to give the new MacBook a run for its money. At most, MS Surface Pro territory.

More powerful CPU & GPU = More heat generated + more power consumed = bigger box to allow cooling + hold enough battery.

The ultra-low-power CPUs aren't even available as quad core at the moment.

If you look at technical specs alone, you can certainly get a Windows laptop with more bangs per buck than the rMBP 15" (esp. if you want a discrete GPU) but it will be a power-hungry brick compared to the Mac. Plus: Windows.

 

Here is your answer - roughly.

 

In a word NO.

 

We are still a long ways away from what you want. The 15" Pro is already the thinnest, lightest laptop with that CPU, with the best battery life by a good margin. Most Windows laptops with that CPU are about 7lbs before the weight of the monster power brick.

Your best bet is probably the 13" Pro. It's not as light as you'd like, but it's by far the best combination of power, footprint, and weight. If you don't need dedicated graphics, the single-threaded CPU performance is actually pretty close to the 15" model.

 

If they existed and cost less than $2k, I would buy several, but I'm not high.