If there is a redesign, it will be Japan-only. The DS Lite is reaching its saturation point in Japan, and Nintendo needs something new in the handheld arena to sell there. Conversely, the Lite is still selling like hotcakes in the States and Europe.
"'Casual games' are something the 'Game Industry' invented to explain away the Wii success instead of actually listening or looking at what Nintendo did. There is no 'casual strategy' from Nintendo. 'Accessible strategy', yes, but ‘casual gamers’ is just the 'Game Industry''s polite way of saying what they feel: 'retarded gamers'."
-Sean Malstrom







