What apex and any DX ROM has been (until now) has been based on the Moto stock rom but modded to remove blur etc... What this means is that we will start seeing Roms built from plain old vanilla android framework. This also means, with a whole lot of work from our amazing devs, that we could possibly see Roms based on future Android releases. This has opened yet another door for devs to build fast, clean roms based on their ideas and imagination, not on what Moto has built.