Despite this rebranding exercise, Nintendo has revealed that you won't be able to transfer points between its new handheld and the Wii. In other words, if you buy a Nintendo Points card and use it to purchase (say) DSWare, you'll have to spend any remaining Points from the card on DSi downloads (and vice versa). This also means you won't be able to transfer any 'spare change' Points from the Wii to your DSi, meaning you're stuck with the 100 Points that have been on your Wii account since about March 2007. THERE'S ALWAYS A SPARE 100 POINTS ON OUR WII. They sit there, silently mocking us.
Anyway, the above slide, dug up by Siliconera from Nintendo's Media Summit presentation, highlights the point emphatically enough: you won't be able to transfer Nintendo Points.
Gallery: Nintendo DSi