Also notice the big ol' 'Rumor' tag on that post. I wouldn't concern yourself over it much at this point. Nintendo just released the DSi, they will not release another handheld system so soon after that.

I'm not going to say 'they're not working on a new handheld', because that would be incorrect. They (and any company) is always working on something new. Just don't bother waiting for it if you're on the verge of purchase already.