New Steam update shows four Steam Machine models, though we still don't have a release date

Presumably that's for different specced models.
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Valve leak shows four Steam Machine models with anti-scalper queue

Four launch models: Code leaks reveal four Steam Machine SKUs, including confirmed 512GB and 2TB versions, with the other two possibly being bundles. Scalper protection: Valve will use a reservation ...
Hackaday

Making Steam-Powered LEGO Machines

Over the decades we have seen a lot of methods for powering LEGO-based contraptions, ranging from LEGO Technic pneumatics to electric motors, but what about steam power? We have all seen those cute ...