Maybe wafer-handling robots from the semiconductor industry? Whatever you're looking for is going to be a very niche product. In industrial robotics, most of the high-speed/low-payload work is dominated by Delta robots like the ABB FlexPicker.
The only robot I can think of (besides from what SkyeFire above suggested) is ABB’s kind of new IRB 1010. It’s small and neat as hell. 
There is the the meca 500.
There is also the (amazing) MotoMini:
A fast industrial lightweight cobot is what I'm after.
Probably not possible. One of the defining characteristics of a Cobot is low speed, because even for a small robot, inertia can still be injurious (or even lethal). If you want really high speed (you keep saying "fast", but not defining any usable numbers), you're probably only going to get that from a standard non-Collaborative robot.
it is only 5 axis but it does look interesting, have not seen programming language. interfacing seem to be limited to built in 16+16 IO and raw TCP - there is no mention of any fieldbus. structure is built from parallel flat sheets which makes easy access to the inside but this also has limited structural integrity. since arm is low power it is unlikely to self destruct but things are different if someone bumps into it - the flat sheets are easy to bend so at the very least accuracy would be gone.
but although arm itself is not powerful (and therefore not really dangerous), the construction was gears and pulleys exposed and that would make them a hazard to not careful finger. interesting thing is that distance is measured in inches.
I read the article you posted, and I agree with all of their reasoning for their size of robot. The stepper motors they use pack a lot of punch for their size, but aren't really a good use for industrial sized robots. for larger robots, you want absolutely no backlash, as that puts the weight of the robot on the motors and it introduces a lot more stress. The stepper motors in their robots will not really care about that because the weight of the robot is so low.
I read the article you posted, and I agree with all of their reasoning for their size of robot. The stepper motors they use pack a lot of punch for their size, but aren't really a good use for industrial sized robots. for larger robots, you want absolutely no backlash, as that puts the weight of the robot on the motors and it introduces a lot more stress. The stepper motors in their robots will not really care about that because the weight of the robot is so low.
I believe their newer models have absolute encoders and are heavier with larger payloads. I am very fascinated with this robot due to its lightweight and trying to see how to reduce weight further. I bought this one with rail kit for packaging operation:
