I've started work on Teaser 4, which has moved well beyond just another teaser.  It will focus on player interaction in the lobby of the Multiplayer Arena at Mt. Hildar Coliseum.  You can see progress at http://dsipaint.com/tmj/tmj_lobby.php.

As more character sprites are developed, I will integrate them into this.  Also, the background will come from the Hildr Coliseum tileset.  As for player interaction, that will take place in the little chat box on the bottom of the screen, display an overlay that disappears with time.  I'm not sure if trading will be a part of this yet.  If it will be, we need to create some items!