GoNintendo.com have found a copy of the Pokemon Battle Revolution trailer with English narration by Satoru Iwata.
He explains how Nintendo expect to expand DS play with Wii. Apparently you will be able to connect with your copy of Pokemon Diamond/Pearl on Nintendo DS and use it as the controller for Wii.
Iwata also states that Pokemon Battle Revolution is set to be one of the first titles to use this tight "connectivity" with the DS handheld.
Pokemon Diamond/Pearl (DS) and Pokemon Battle Revolution are all expected to be released later this year in Japan, and follow soon after in the US and Europe.