Yeah, its different. Not a whole lot to it, I wonder if Nintendo is going to flesh it out some more.
I now have enough coins to "buy" Twilight Princess Picross or WarioWare Touched for my 3DS. Leaning towards WarioWare. Or do I wait until that expires and see whats next? The coins only last 6 months anyway so it wouldnt be the worst thing to just buy something.
So I learned the weekly coins timer resets on Monday. You can go do your weekly logins to get easy coins. The main ones are Miiverse, the eshop, Nintendo.com, and My.Nintendo.com. On My.Nintendo.com there will be a little platinum coin next to the big platinum coin box. Click it and you get 30 coins. Miiverse and Nintendo.com I was able to just use my web browser thats already logged in. Visit and done, another 30 coins for each of them. eshop I just did on my 3DS, not sure if the new web version counts or not. All told thats 120 coins a week for next to no effort.