PM on App Engine here. We'll continue to be using (and monitoring) the Google Code issue tracker until we have a robust alternative available.
We have plans for this, we're just not ready to talk about them yet.
Is this a plan just for AppEngine or for all other Google Products that use Code as an external Issue Tracker?
For instance if you want to file bugs for AppEngine the official way is through Google Code
https://code.google.com/p/googleappengine/issues/list
What are the plans on moving this and other issue lists for different Google products out of Google Code?