Anybody else looking to move from AppEngine? I can't wait to try this out, AppEngine has become too expensive and AWS has more and better deployment options, and more and better associated services.
AWS doesn’t have anything even remotely approaching Appengine Datastore in functionality and scalability. S3 is also inferior in functionality to Google Cloud Storage, e.g. eventual consistency, no atomic operations. That’s actually a big deal if you’re building anything slightly more complex. OTOH, Google is now introducing their Compute solution, so you can just move parts that don’t fit very well within Appengine to that (if you have beta access).