The DS Lite is much trimmer than the original DS. When folded the DS Lite is 133.0 x 73.9 x 21.5 mm compared to the original DS (148.7 x 84.7 x 28.9 mm). They definitely shaved off some weight to with the DS Lite weighing 218g compared to 275g.
Nintendo has officially announced that its Nintendo DS Lite handheld will be releasing in June. The DS Lite is 20% lighter and smaller than its predecessor. The US launch date is June 11. However, the Australians will get the new DS Lite on June 1, 10 days ahead of the US launch. The Australian launch price is US$152 as compared to US$130 in US.