It sure sucks to invest in a product and then see it shut down. However, I like the idea of a company that constantly tries new things, iterates and is not afraid to pull the plug if it doesn't work rather then have hundreds of zombie products that suck the profits.
It's not possible at the moment. A week or two ago they introduced shinymeta which allows you to save the state of the R environment but that doesn't extend to js objects.
I've just learned about transformation matrix and I'm not sure but I guess so. I would say its essentially about how a human can draw spheres on a paper.