No need to post again. Have some patience, please.
The 9800 hasn't been released yet so I doubt that anyone knows for sure.
However, an unlocked 9800 from ATT should work on the Rogers network. Just how well, we won't know until it has been done a few times. You won't have any tech support to get it set up correctly or if you have any problems, either.
Why not wait until it is released on Rogers?