Graphene is an interesting area of research, and one that is very "hot" right now. My lab mate is doing research on it and it seems like every experiment he tries to do, someone else comes out with a paper in Nature about it the next week.
From what I gather, as soon as graphene can reliably be "printed", we'll get to see some interesting devices. Already some teams have had success with building transistors. http://physicsworld.com/cws/article/news/37204
Lots of interesting Physics is still left to do. There will be many breakthroughs in the coming years.
Reading the paper, it seems less useful than perhaps imagined. They claim to be able to reversibly add hydrogen to change the properties of the graphene. This does not seem to lend itself to fast-switching transistors (it seems that the reversal requires ~450C, and hydrogenating requires several hours to fully saturate the graphene.
The big issue is that they have appeared to create a configurable resistor, not a semiconductor. Unless major breakthroughs are made, I doubt that this will be able to replace silicon as the fundamental technology behind computers.
From what I gather, as soon as graphene can reliably be "printed", we'll get to see some interesting devices. Already some teams have had success with building transistors. http://physicsworld.com/cws/article/news/37204
Lots of interesting Physics is still left to do. There will be many breakthroughs in the coming years.