They must have come to some agreement, because I do still see those Swans being sold, even with the new line out. There are other companies out there who also use the same tweeter apperance, so I know it isn't a simple matter of how it looks.
B&W has already successfully sued a few companies over the design of their tweeters, as it is a patented design, I believe. Just because it looks good or the same, doesn't mean it will sound good. I don't think SVS is a registered trademark (which now that they are growing might be a good...