Basically CFF is CID with a new 'wrapper' around the data. Instead of making 2 upgrades in succession, it might be better to wait until the OpenType version appears and then upgrade. However if you plan to work with PDF, upgrading to CID now will be in your best interest. And there problems when working in a mixed environment. To be blunt, this is a major expensive pain in the ass, domo arigato Morisawa.
Licenses are very restrictive.
All Morisawa ATM fonts and Adobe Morisawa fonts are locked. You can only install them on one hard disk, forever amen. If the hard disk is initialized for whatever reason, you have to get a replacement floppy. You cannot convert Morisawa fonts to outlines in Illustrator, FreeHand or any other graphics program. You cannot print Morisawa ATM fonts to a PostScript printer unless they are installed on that printer.