There is a new study and translation of Andrew of Caesarea's commentary of Revelation (via Roger Pearse) and it is available on-line!:
Andrew of Caesarea and the Apocalypse in the Ancient Church of the East: Studies and Translation
In this connection I should mention Juan Hernandez' recent work on Andrew of Caesarea as a text-critic. Hernandez spoke at the SBL in Boston on this subject).
Finally, I should say that Andrew of Caesarea's commentary often accompanies the text of Revelation in Greek New Testament MSS. Since the Book of Revelation has had a quite distinct history of transmission, there are many MSS containing only Revelation out there, and I suspect that many such codices are still unknown to the scholars of textual criticism.