Due to the general lack of playtesters at the moment who could play the pro upgrades, HMX opted to leave this element out of RBN2.0, to the chagrin of many hopefuls.
And although far from a utopian solution, I'd like to propose an idea for pro guitar/bass upgrades in RBN.
First of all, it would involve some effort from HMX. But in the same way they've made a habit of adding pro updates to a couple songs some weeks—and had a massive slew of upgrades that one week—maybe quarterly or so, they could add pro upgrades to the best selling/most deserving (i.e., Eiffel 65 probably would not get one) RBN songs.
Now, I know that's a difficult process. But if the guitarrist submits accurate tablature of what they did upon submission, and the author hands it over to HMX if they'd like to consider the song for a pro upgrade... That's gotta cut down on the workload somewhat, right?
Just some food for thought. I don't mean to sound ignorant of the process, or the reasoning that led HMX to their decision not to include Pro G/B in RBN2, but just thought that this would be—while not as entirely inclusive as many would like—a great way to keep all of the RB3 experience on the table for RBN artists.