Well, I wouldn't expect it to be guaranteed to work with all minolta cameras (dating back years).
I'd expect (but not absolutely assume) that it would work with 7D & 5D, just like I'd expect (but not assume) that the 3600 hsd & 5600 hsd would work with the A100.
After all the Sony models are close to being straight reproductions of the 5D & 5600 with nice new SONY badges. Yes, there are some differences, but I would think SONY would be careful enough to make sure they can retain existing KM customers by retaining compatibility - we're their foot in the door of the lucrative dSLR market.
It's frustrating that the person you spoke to wasn't properly on top of it, but clearly they're still finding their feet with the product range - most of which hasn't even hit the streets yet, after all. Won't be long before all of this is much clearer.
Having said that, I'm not planning on being the very first to find out...
that's one of the great advantages of forums like this - word of mouth & shared experiences