Comments indicate nobody really understands what Mastered for iTunes means.
For those of you who already have albums by The Smiths – as I understand it, if you bought them on iTunes you can delete your download and redownload them again for the new files. If you ripped them from CDs and use iTunes Match, you can delete the downloads and redownload them from within the iTunes software. Do not delete from iCloud.
It’s hit and miss on whether or not you get that pretty Mastered for iTunes badge. Krik Mcelhearn wrote about this before.