The DSi isnt released yet and its possible that platinum will be in america before the DSi since the DSi isnt out in japan while platinum is like three months away from us release. and besides when the majority of people are going to have the ds/lite why would they remove it?
The DSi has been released in Japan. Nintendo wants to release it in Europe during springtime 2009, and the US at a later time, iirc. Platinum will be released before the DSi.