Sources talking with Tech news site, BSN, are reporting that nVidia are working with Nintendo on a new DS, due to be announced next year.
If true (and it's not confirmed, although pretty possible), it would allow a proper next-generation DS, with enhanced graphics and processing power, but allow backwards compatibility to be maintained.
What's important about this, to us, though is that it indicates that a new DS could be on the way within the next couple of years. With Generation IV seemingly drawing to a close - and the possibility of the first Generation V Pokemon being announced within the next few months - this would match up strongly with the recurring constant pattern of a new Generation of Pokemon tying in with the launch of Nintendo's latest handheld.
The timing of this is hard to ignore - and while this is all speculative - it does all add up. Don't be surprised if this story holds true, and next year bring with it a brand new DS - with the year after likely bringing us our first Gen V games exclusively for it.