The Walker Legs update is scheduled to arrive on February 23rd. It will feature the Walker Leg module (two size variations are currently planned), as well as some other less major improvements and additions.
As mentioned before, walking units should be quite stable and maneuverable, and take less space - making it possible to design taller units.
Legs are also slower than other propulsion methods, and adding more legs won't provide an increase in speed. However, they are made to be retractable, so it's possible to combine them with other land-based propulsion devices, and switch between them when speed is a priority.
More info will follow when the update releases, and as always stay tuned for more news!