Looks like they are doing a different comic each month with a special limited metal cover. First month is the new White Ash Presents: Glarien, but it’s already sold out
I got one because I like cheesecake covers and as someone who grew up in the 1990s love cover gimmicks like metal, lenticular, etc.
I knew you’d buy one of these atrocities of a cover… 
Most of them don’t hold long term value.Limited doesn’t mean that it’s in high demand.
I know, I know. I have an affinity for covers with cool explosions or some cheesecake. I have friends who collect them too, so I can always sell stuff if I decide I don’t want it.