The folks from oneOpenSource.it have posted an interesting interview with Linus Torvalds where he discusses Microsoft's claims of Linux infringing its patents, the Linux kernel, among other things. Here is a quote from the interview when he is asked about GPLv3:
I think it's just another open source license, along with about fifty other open source licenses out there (BSD, Mozilla, etc). It's no longer a really bad one like some of the early drafts were, but in my opinion the GPLv2 is simply better.
Newer versions don't necessarily mean "better", especially when the new versions are more complex, and limit usage more.
You can read the full interview here.