My suggestion is 1/8" blade thickness and no more than 4" long.
Still hoping for D2, but I won't hold my breath.
And I'm sure I'll be the only one to ask for the Wardog handle.
I like the idea of the War Dog handle for the Muk, probably my favorite handle on blades under 6". I'm not really a big fan of the mudder handles like everybody else is, not to mention it's already been done on the ScrapMuk.
I also think .170-.180 would be about the perfect thickness for this blade being that it's supposed to be a slicer. A wide blade at this thickness will have a thinnish edge while still being somewhat heavy duty.