The DSi XL, the much larger companion to the DSi, has been given a solid release date for the DSi XL: March 5th. For those that are not already familiar with it, the DSi XL is a larger version of the DSi, with 4.2" screens and a pen-sized stylus.
It's designed to be used in a family or party scenario - imagine everybody gathering around the DS and watching two folks fight each other in a Pokémon battle, for example. Also, to let people who can't see perfectly play Brain Training. >>