I posted a link in one of the 'blinking trade icon' threads to a post at .com where CA confirmed it would be fixed in the next patch. I think the reason you don't see them come on and tick off every single thing they fix is it would only encourage people to clamor for confirmation that their pet bug will be fixed next, then screeching for constant updates. I'd guess CA has their own prioritized list of critical/moderate/minor bugs, to which they're assigning their time and resources accordingly.
This particular issue (withdrawing AI forces smacking into your off-map reinforcements) is probably a moderate bug. To be honest, i've never even encountered it yet.
edit: and keep in mind that a game of this depth and complexity is simply bound to have bugs. The first patch for MTW contained 10 new features, 51 SP campaign fixes, and 14 MP fixes.
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