Bonjour Philippe!
Okay, so basically, Here is a breakdown of the information and how we spread it :
Latest version and the APIs related should be seen in our public site,
here, and follow our SDK releases
here.
Google Groups should be used to ask open-ended questions, kinda like "discussions" about the best practices and ideas for the platform.
Stack Overflow should be used for specific programming questions about the platform, whereas Serverfault should be used for Google Compute Engine questions
There is also the
Issue Tracker you can use to notify us (or look up) Defect Reports and Feature Requests about the platform.
Is there anything else I can help with? :).
Cheers