Nope and I don't really think they will, they will probably continue to semi-support the DS like they have so far.
Microsoft and a lot of the industry consider Sony as their main rival, while Nintendo if off doing a totally different thing. That is why Microsoft is more willing to support the DS then the PSP. And by support I mean allow Rare to make the odd game and license out properties like MechAssault to other publishers.
The Zune destroyed Microsoft's device profits for this year. And they aren't going to support Sony. Making games for the DS is pure profit, and there is a much larger installation base