Looking good, fingers crossed it turns out well. Got a bit more info from their website. Seems download play is a go, it mentions you can play a MP even if the other player doesn't have the cart. I'm sure there are limitations but this is great news, after the debacle of Mario 3on3 I wasn't counting my chickens. The friend limit is 20 as well, seems very low. Not sure how it'll affect potential tournaments or leagues.
You can also exchange players you've created and there seems to be a rather substantial addition in the form of World Tour. Not sure if this is an online thing or not because I can't make anything out from the website, pure gibberish. Little help?
http://www.konami.jp/we/weds/index.html