According to in which the story was discovered, the screen size is seemingly the only alteration that would be made in the redesign. We'll keep you updated if this rumor becomes truth and heads stateside. The latter is doubtful, though. We really have no respect for our elders here in the US.
Nintendo considering larger DSi for the elderly in Japan
27.10.2009
recently uncovered a story from Japanese daily newspaper Nikkei Shimbun stating that Nintendo will release a new model of the later this year that will sport four-inch dual screens--an increase of 3/4ths of an inch per screen. The impetus for this increase is reportedly to satiate elderly Nintendo customers, who have requested larger screens.