I sure think so. Less a killer though and more of a real continuation of it. Not to say the Gemini, Astro Slide, etc isn't continuing it, but Planet Computer's devices run Android and not mainline Linux like the PinePhone does (sure you can run Linux, but only with an android kernel).
Also this won't cost $300-500 like all of those others do, which of course means you get a slower phone but since this is probably more of a Linux tinker toy so far, not too bad.