I've seen quite a few mock ups of the new Leon that look like that so it may have some truth about it, however I don't even think there are any official pictures of the next A3 yet which will probably surface a good year or so before we see the new Leon. The current A3/Golf/Leon were released in that order and most of the fuss at the moment seems to revolve around the mk7 Golf so it could be a while yet before we see the next Leon.
I really hope they do a good job of the next Leon as the Golf is just getting too expensive now.