From the latest update today:
Posted By Caspian
Pre-Alpha with VoxElyria Beginning around April, and the completion of Release 0.3.0, players with Alpha 1 access will able to log into a pre-Alpha version of Chronicles of Elyria using the VoxElyria client. For those unfamiliar, VoxElyria is a voxel-based web client that we've created to quickly iterate on gameplay mechanics. It still connects to the Chronicles of Elyria backend, but doesn't use the Unreal Engine as a client. This separation means that we're able to get CoE into the hands of players even while we continue to iterate on systems which are heavily dependent on the UE4 client; systems such as crafting and combat, which require a full 3D user-experience.
>As this is a Pre-Alpha release, it'll be under NDA and will be put into the hands of our Alpha 1 backers first. Anyone who has a pledge package with Alpha 1 access, or who has purchased Alpha 1 Access from the a la carte store will be among the first to step foot into Elyria.
After that, we'll continue to increase the size of the pre-Alpha audience at irregular intervals, depending on how the pre-Alpha testing is going. We'll first move onto backers with Alpha 2 access, then Beta 1 access, then Beta 2 access, and finally we'll open up access to all community members who have purchased a package and will lift the NDA. In the meantime, we wanted to show you some Work-In-Progress characters. Here you can see what a couple of the tribes look like in VoxElyria.
Hope that provides some clarity.