He did one for Dynamite's Turok The Dinosaur Hunter #1. he's doing one for Magnus too. Rob Liefeld gives us a defeated robot. And no short skirt.
And as with the Turok, it's very existence is a way to persuade retailer to knock up the numbers for the comics' Final Order Cut-Off numbers.
Any retailers who increase their initial orders on the book by 20% can order as many Rob Liefeld covers on top of that as they want. And for every fire of the Liefeld covers they order one of the Rob Liefeld Rare(r) Black And White Line Art covers, for those who want the purity of the Rob Liefeld experience.
Yes, all of you.