Judging by the videos I've seen, it appears that, as Wfz says, Link has just changed style. Instead of being a version of marth, they made him a long-ranger defensive guy, which IMO is more correct.
http://www.youtube.com/watch?v=5vQ31CBv2BA
That video makes it look like Toon Link, is really the old link. He is more mid-air based, has weaker range attacks, and is fast enough to go berserker.
http://www.youtube.com/watch?v=DuL1DTfoXXc
This guy, should have used Toon Link, he uses the wrong play-style for TP link.
http://www.youtube.com/watch?v=e4BTmYccUX4
Here he starts out great. Uses ranged to make Marth have to make the first move. When Marth comes close, Link dodges and attacks. I think this is how he should do it.
http://www.vgchartz.com/games/userreviewdisp.php?id=261
That is VGChartz LONGEST review. And it's NOT Cute Kitten DS