Apple will try to better differentiate its AirPods lineup as new models launch over the next couple of years, according to a new report from Bloomberg’s Mark Gurman. That will include phasing out both the second-gen and third-gen AirPods when a successor is announced sometime next fall. Gurman claims that the third-gen “regular” AirPods haven’t sold particularly well and partially attributes this to consumers frequently opting for the older, cheaper second-gen pair, which Apple has…