I have searched high and low on the internet for it but no luck. It's such a teaser to advertise the Bold for that cool screen but not allow us to have it! Anyway, I found a couple pics online that may work and used the wallpaper maker here at Crackberry. This is one of Dallas:
I believe the one you are refering to is actually available on the bold site. Its under Blackberry Bold, then under Wallpapers. They have three available: appears to be San Fran, NY, and DC. The link is as follows - you will need to delete spaces in the http as I don't have the requisite number of posts required for links...
h t t p://na.blackberry.com/eng/devices/blackberrybold/bold_downloads.jsp
Ha - they are for desktops. I just assumed - bad habit - that sense it was a phone website that the wallpapers they were advertising would be for a phone.
Of course that would be logical and nothing with the release of this phone has been logical.