Today's 4th edition art preview shows three very different looking devourers. Are these three different types of devourer or three different stages in a devourers "life cycle"?
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Multi Stage Devourer
Mon, 2008-05-26 11:26
#1
Multi Stage Devourer
Mon, 2008-05-26 11:32
#3
Multi Stage Devourer
I'm not sure. That largest one is pretty creepy, with impaled spirits on its spine-connected bone-spikes. 
Mon, 2008-05-26 16:38
#4
Multi Stage Devourer
That does look like a mohrg.
I don't think the "spirit of a raving murderer reforming in the Shadowfell" background is nearly as interesting as the "creature who died with its soul separated from its body in negative energy-tainted realms of the Astral or Ethereal Planes, endlessly seeking to fill the void left by its missing soul, the first of which being a powerful renegade githyanki who slew the previous Lich Queen" background from the recent Dragon ecology.
I do like the one with the impaled spirits. That is nicely creepy.
Mon, 2008-05-26 18:58
#5
Multi Stage Devourer
I'm pretty sure the one in the front is the Morhg. An undead creature I never felt was that impressive compared to the Devourer. Now it seems like the Morhg is now Devourer Jr.