What I'm looking for is the following. Maybe there's a plugin and I just haven't found it yet?
Looking for a plugin that creates a process for "post updates", so that rather than going back to an entry and manually adding, say, "UPDATE: Since this post, something's changed on this story. Foo bar et cetera." one could go into WP, go to an entry, click "Add New Update" and it would create an entity not unlike a comment in that it's a separate object, but attached to a particular entry.
There'd then be template code to display any Updates that might have been made to each post.
Does a plugin exist that does this? I've been trying to find a blogging platform, in itself or via plugin, that does this since my early MT days.