It's a shame that app engine is still running on go 1.4.2,
I would have understand if it was using 1.5 (since 1.6 is still quite new) but 1.4.2 still uses the old and slow GC.
And now this...
If you pay attention to where AppEngine is getting love these days, it's moving towards Google-accessing libraries on VMs, and becoming relatively language-agnostic. The just released Node.js libs, and other languages are coming.