Too much negativity here!
This is just a look at possibilities.. not a future design. All-in-all, very interesting.
An all glass cab like this would be great for visibility, but not very practicle in reality. I like that it can move up and down - it's very similar to forestry excavators or the types you see in wrecking yards that move up to see over large piles of scrap metal.
The tracks are interesting - alot could be done here but as was mentioned before, probably too much expense to justify.
the moveable counter weight is great, and the lasers could be used to show you your surroundings and even the dimensions of a hole you are in! A system like that that was high-mounted that could automatically read and display grades would be fantastic.
Excellent design thinking here.. in terms of the boom design, you never know what can become economical when forward thinking is applied.. it may look un-doable, but could prove to be quite useful (enclosed hydraulic lines, etc). and, material sciences are always advancing.
I say Bravo Volvo.. keep it coming!