These anonymous guys are complete effing idiots..meaning any training FBI is doing in catching these folks is actually doing the FBI more harm than good in that its not preparing them for the hard serious hacker threats such as China hackers..
As far as I'm concerned there is evidence of some high profile hacking teams somewhere in the world doing some nasty stuff (such as the fraudulent certificates and hacks on companies that was tied back to Stuxnet). We don't know for sure who does it but a lot of people assume the chinese based off of (what I think) is IP traces.
Its all speculation. We know that someone is hacking, just not who. Its obvious that they're good because there hasn't been enough evidence to pin it on anyone. As anyone on this site should know: IP isn't a very good identifier and even less so for professionals.