Vegeta goes into a rage after Bulma is hit and taps into some kind of unknown potential and puts up the best fight against Bills/Beers out of all of the Z-Warriors (and even manages to land a hit or two on him), including SSJ3 Goku. Its then remarked that Vegeta - in his brief powered up rage - has surpassed even a Super Saiyan 3. Goku even congratulates him at the end of the film, joking that they should have the enemy hit Bulma more often. In space Bills/Beers and Whis remark that both Vegeta and Goku will prove to be "fearsome foes" in the future.
Since BoG is looking like its going to shape up to be the start of a new series of movies or a series, I think it'll be interesting to see where Vegeta's character goes from here. I wonder if Vegeta's secret to tapping into his latent power has to do with defending his loved ones, which would be ironically poetic considering his entire personality during DBZ has been selfishly fighting for himself and only now when he's settled down with different priorities in life does he have the potential to surpass Goku.