I'm concerned about what the 36 movement (Warlocks list) will do to my imagination. I hope you are right about his diet making it slower (Silver medal 28, Gold 20 ?). The replenish idea will make it too strong IMO (just look at the stats, already!)
When the Glutton swallows a unit and the Glutton is killed the last eaten unit pops out, having 1 hp. Cool he?
I've asked several times if the Glutton is able to 'tongue' flying units, but I've never gotten a clear answer. I think it's not capable (would also make it too strong).
I also don't think there will be unit differentiation on size. Would be nice, though!
If there is any chance of 'repatching' Lizards in an expansion we'll battle for it, right? I do demand a Lizard Queen able to lay and hatch eggs (lvl 0 and 1 units). Your Croc can become lvl 3, then? And lizards will have more terrain-ability interaction in general (other than movement) like swamp concealment and create swamp.