Well...since here we're referring to "Management Stacking" (so management of a stack of Switches using just one Management IP)...and not Virtual Switching (VSF deployed through frontplane stacking or Backplane Stacking deployed using dedicated Stacking modules/cables)...I think, as a feature, it will not be added into Aruba 2540 (yes, as a feature, some HP ProCurve had it...but things are evolving and some requirements are fading out, some others are fading in)...especially considering that you can easily manage (any number of) them through NMS solutions like Aruba Airwave or HPE IMC.