Down aerial
I created a topic on Smashboards, but I think it's worth mentioning here too; Marth's down air was briefly shown during 3DS footage, and it appears to cover a far wider area than Brawl. Topic here Video here FlynnCL (talk) 06:28, 9 April 2014 (EDT)
Forward aerial
Forward air was clearly shown during the Direct, and it appears to cover a far greater range than the Brawl counterpart. Marth appears to suffer longer landing lag. GIF Picture FlynnCL (talk) 08:37, 10 April 2014 (EDT)