Atom 1.0 support may not be forthcoming, but a Google engineer pointed me to this post on a blogspot-hosted blog announcing a RSS 2.0 feed. The engineer also indicated Google was aware of the issues with Atom 0.3.
If you have an RSS feed for your blogspot blog, it will look like this:
Let me know if your blogspot blog is RSS 2.0 enabled. I’m taking an informal poll here. You can email me at firstname.lastname@example.org or leave it in the comments.