The last edition of the Studi gregoriani  contains an interesting article by Alberto Turco: "La bemollizzazione dell' Antiphonale monasticum". He refers to the Liber Antiphonarius part 1, edited in 2005.
Despite the discussions about the b-flat in the editions of the Liber Antiphonarius (2005-06-07) and the new Antiphonale Romanum (2009) I was able to trace 17 antiphons from the Codex Hartker that, to my knowledge, weren't edited in Solesmes Sources uptill now.
Elevata est H 391-068
Dominus quidem Iesus H 391-071
Israel potestas H 390-094
Super ripam H 390-108
The margins of my Hartker are almost filled completely with printed sources.
How is yours?