Here is a list of the possible list of deleted scenes to be included on the DVD Collection as reported by the R2 Project :

Untitled (Seems to be set in Sicily, with two gentlemen calling on a small house which judging by a later deleted scene is in fact Vito's house and Vito as a small boy.)
1917 Fanucci Attacked
1917 Clemenza: "I'm My Own Boss"
1917 Playing The Flute
1917 Discussing Fanucci
1917 Reasoning With Signor Roberto
1917 Don Vito Corleone
1918 Introducing Hyman Roth
1927 Vito's Revenge
1945 The Death Of Genco
1945 A Gift From Woltz
1945 Hagen Sees Janie
1945 A Family Fight
1945 Michael And Kay In Bed
1945 The Don's Been Shot...
1945 Sonny Absorbs The News
1945 Michael Gets Involved
1945 Planning Paulie's Death
1945 Clemenza Enjoys Lunch
1947 Communist Demonstration
1947 Seeking Vito's House
1947 Yelling In The Shower
1947 Bring Me Fabrizio
1948 Talking In The Garden
1948 Hagen: "Why Am I Out?"
1955 Kay Lights Candles (With End Credits)
1958 Fredo And Deanna
1958 No Champagne Cocktails...
1958 Francesca To Marry
1958 Fabrizio Located...
1958 Anthony And Pentangeli
1958 Neri Humiliates Klingman
1958 Murder Of Fabrizio
1979 The Godfather Part III: Alternate Opening Sequence

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JG