I would definatley wait for what's on the horizon. the Bold is great but being on my fourth BB and third cell phone carrier I have definatley T-mobile and Blackberry to be a rocking combination.
PS if your listening T-mo get your 3g data/voice network rolled out and find a way to make UMA to work wth 3g on the same device.
I was always excited for the Blackberry Bold because of how it looked and from what I've heard, it's a pretty neat phone. I like the fact that it has a full keyboard even though I'm fine with the keyboard on my Pearl and the wide screen looks nice too.
I also love my Blackberry Pearl because of its size and how it can change the colors of the trackball. I don't know if it's possible with the Bold, though. I think the Javelin looks nice too but I like the Bold more.