By default Spyder uses Python 2.7.2, and my question is: is there a way to set up Spyder so that it automatically uses Python 3.x? Thanks!
Since end of May 2013, version v2.3.0dev1 of Spyder works for Python 3.3 and above.
It is in a usable state but there are a few minor problems.
Hopefully they will be resolved soon.