I am having the same problem with "Gotham news" from Woo themes.
In the Reading settings I was specifying a frontpage (home) and a posts page (blog). After the upgrade, the posts page started showing the content of the home page, but formatted as it if were a post.
My plugins are all deactivated. I've deactivated them before upgrade so i don't believe it's some of the plugins that cause the problem.
On Woo themes said that it's WordPress bug and that they are waiting for the fix, but when i switch to Twenty Ten posts page shows the right content.
So, is this a WordPress bug or theme has to be changed some how?
If you need i can post a link to snapshots of how our blog looks like after upgrade with these themes.
I would appreciate any answer because we want to upgrade our WordPress as soon as posible.
Thanks in advance