the new German Homer commentaries ("Gesamtkommentar") are only on the Iliad, none on the Odyssey. And I would not call them just updates of the old Ameis-Hentze-Cauer (although that's what the authors themselves call them) but new works entirely.
And are they good?
Actually, I'm looking around for resources for a second reading of (parts of) the Iliad. So far I've come up with:
-Basler Gesamtkommentar, so far ...