The picture of the "Blizzard Arcade game" is a MAME box. It got moved from building 3 though to somewhere else.
I worked at Blizzard for 3.5 years, and one the hands down fucking coolest thing they haven't shown is the arcade cabinets in building 3.
One guy brought in his cabinet, which used to be champion edition. It got converted to SSFII turbo and last I knew of, it was alpha 2. So many fun times on Champion and SSFIIT :X
Another QA dude bought an SF3 3rd strike cabinet off craigslist and brought it in also. That cabinet was later converted to an emulator, but still ran 3rd strike. I never played 3rd strike before, but I still believe it is the most balanced, and the best fighting game in terms of twitch skill, technical knowledge, and mind games.
Another person got an MVC2 cabinet also.
Also, the GNOC, (global network operations center) looks way the fuck cooler than that artist depiction, which just seems old and outdated. It is NOT "the server room," it's just where servers are monitored. There are clusters and clusters of servers next door though, although I'm not even sure what those are.