I haven't dug into the docs much. This really does return vectors? Because all of the OSM servers and services I have seen return tiles that are bitmaps, which for the type of data being displayed always seemed like a rather moronic way to do it.
Before anyone gets too deep I'd like to point out that this is just about hosting vector tiles, the actual tile gen is a separate project. Not to say that hosting large sets of files is trivial, just that there's more to the picture than one repo.
Loading vector tiles should require significantly less data/bandwidth while also offering completely linear scaling without any steps. I hope this works well enough to eventually replace the current implementation.