Not yet. Plasma Active relies on conventional Linux graphics stack (X.org or Wayland), and getting Linux drivers for mobile GPUs is a huge pain, let alone open source ones, because manufacturers are distracted with Android). Mozilla decided to avoid this, and relies on Android graphics stack in B2G (Firefox OS). So their efforts with manufacturers won't benefit Linux at large, as Android itself does not.
That's the biggest flaw in Android in general from the global Linux community perspective - i.e. it's totally isolated nature, caused by early design decisions (while it was still proprietary and any community interests weren't even considered) which led to incompatible graphics stack from the rest of the Linux world. Unfortunately Wayland was created somewhat later, and Android was already going in totally separate way.