Importer NCSX has confirmed the existence of a Wii version of Milestone's Illmatic Envelope, first seen as a Play-Asia listing. Milestone has seemingly foregone the customary "last Dreamcast game EVER!!!" release of their NAOMI-based shmup in favor of a system that is still being produced. The November 13 release date found in the Play-Asia listing was accurate.
At this point we'd normally start speculating about a US release for the vertical shmup, but to be honest we're still suspicious as to the prospects of the Ultimate Shooting Collection. Sure, it looks like it's going to come out, but so did Radio Allergy on the GameCube. Let's get that out, and then we can start crossing our fingers for Illvelope.