I'd loved that mud only affected to heavy armor, leaving these maps to infantry and light vehicle play.
But it seems at the end that mud is the brown snow that everybody expected.
What i experienced is that mud is the high snow for tanks.
While infantry moves very slow in high snow, they are actually doing fine in mud.
The other way around: Tanks get quite fast through high snow, but it's a pain in the ass to get them of mud.^^
So -> snow != mud.