GW, Giant Robot armies + plague zombie horde armies have just made me so damn happy. So friggin' happy.
Looks like it may have a new base?
The comparrison looks about right, but the base seems distinctly wider. Could just be perspective trick though (unintentional of course)
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I think it might be a new base as well. The perspective may be off a little, but if you look at the image with the trygon, although you cannot see the lower portion, the knight body is significantly wider than the trygon. Alone the Trygon is still pretty wide considering its scything talons. I look at the photo of the Knight with its base, and it has space to the side of its feet. While its body is significantly wider than a trygon, its feet are wider than its body. It almost has to follow its on a larger base.
Another thing to consider is that all modern GW bases are of uniform height. Check out the height of the base - it's consistent, but only if the knight's base is broader across than the others.
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Apparently it is the Mumak base, a 7" by 5.5" oval that thus far has not been used anywhere else. And GW likes to reuse bases as much as possible- see how the new flying stand for the Valk spawned the large oval for 40K, and how some of the larger base sizes have spread throughout fantasy.
Could be the same size but the Mumak base is textured and not re-usable.