The detention of Ali Aboutaam has now been covered in the Lebanese press. A story featured in today's Al-Akhbar (Beirut; January 23, 2009; in Arabic) giving details of the Interpol arrest warrant. Postings by Arthur Brand on the Museum Security Network were cited.
The Lebanese story also mentions the case of the mummy mask ("Ka Nefer Nefer") in the St Louis Art Museum.
Phoenix Ancient Art has issued a statement concerning the incident in Sofia. This seems to contradict the version of events posted by Zahi Hawass.
Perhaps somebody from Egypt's Supreme Council of Antiquities (SCA) could provide a little more detail?