That's obviously not something to be happy about but then again an argument can be made that the introductory free quota that Google gave was very generous.
This might give Go a push - as I understand it Go is the most efficient of the supported languages which should translate into less CPU hours => less money. On the other hand, other than template parsing/substitution, my code doesn't do any CPU intensive tasks. On the other hand, the CPU hrs might count the overall overhead of the platform, which for statically linked Go will be the smallest (both Python and Java have sizable runtimes that need to be initialized at startup - according to http://www.youtube.com/watch?v=HQtLRqqB-Kk, Java runtime is especially bad in that regard (this is towards the end of the talk in the q&a part).