If they want to include it on an EP or as a Japanese bonus then whatever. Pretty weird to announce it with cover artwork, etc. Does anyone really want covers from an MDM supergroup anyway? Admittedly a cover of something off Lunar Strain would be sick with Stanne and Jesper in the band, but anything else... meh.
The best covers IF did were the non-metal tracks. It actually feels creative to convert a pop track into a genuinely cool metal song. Metal to metal, not so much.