It's probably going to be BB Navigator, which is the TomTom powered one. I got a copy on my Torch 9850, thru the blackberry beta program, and as one that has used BB Traffic, BB Navigator is a huge improvement. I've only used it a couple of times, but from what I saw, there was no long pause with "Recalculating...." if you went out of the path it shows. It updates very quickly with a new route, and you only hear a couple dings to let you know the new route is being displayed. The whole interface, on BB7 is much improved over BB Traffic and smoother operation. It zeros in on where you are very quickly, when you start. BB Traffic bugged me on how long it took to identify where you were at when starting.
I am sooo looking forward to BB10.