Shown towards the end of the Japanese Conference stream by Iwata-san himself after a ton of 3DS game trailers and information tidbits, the new model of the 3DS looks to be what the DSi XL was to the DSi; the same bells and whistles in a much larger form factor with all the advantages that brings.
Together with the vastly increased screen size (and the reported wider focus zone for the 3D on the top screen), the 3DS LL (or XL as it will be known outside of Japan) has more of a curved and matte rounding to better fit the hands, and most importantly a stronger battery, making a fully charged gaming session reach between 6 and 10 hours.
In the European Nintendo Direct, it was revealed that the unit is already into complete production and will release in the UK just over a month from now, on July 28th. It will come in the three colours�pictured above; Red, Blue, and Silver, and will also come with a 4 Gigabyte SD Card, as opposed to the 2 Gig card with the regular 3DS.
Due to manufacturing costs and the desire to keep the XL at a similar pricepoint to the regular 3DS, Nintendo have stated that it will not come with an AC adaptor or stand, though these will be sold separately, and any adapter from a DSi, a DSi XL or a 3DS will also work with the unit. This will only apply to Japan and Europe apparently, as the US edition will indeed include a charger.
Stick with C3 for more updates on this new hardware as they come.