That's a good question. I think it's defined by the HSPA, which gives you a range of speeds. It's very difficult to say what your actual speed is going to be, because it depends on how many people are within the zone and so on. It's hard for me to give you a precise answer on what that means, but it's mobile and it will support a BlackBerry.
On March 15th, 2012. See this statement in context.