3DS eShop (Thursday) • Dr. Mario (NES, $3.99) • Cave Story ($9.99) • Samurai G ($1.99) • Digital downloads of Super Mario 3D Land, Mario Kart 7, Starfox 64 3D, and Zelda: Ocarina of Time 3D for $40 each
3DS eShop (Sunday) • Pokémon Dream Radar ($3.99)
3DS Demo (Thursday) • Style Savvy Trendsetters
New Super Mario Bros. 2 DLC (Thursday) • three DLC packs at $2.50 each
Yes, Xbox Live can still be used. You can play Halo 2 against people who are using their 360's even, though I imagine there aren't as many people playing that now. I know some people hate Halo 2 but I have to wonder if they ever tried the online play.