Some more Sunny screens from Hideo Kojima himself. Beware of spoilers!
Short description (block text to read):
You can see Raiden and Sunny talking to each other. Kojima’s description on one of the photo was ‘Long time no see, Raiden.’, so that might be one of Sunny’s lines in the game (notice the Japanese subtitles).
Another screen posted by Kojima that could be from the same cutscene (based on the similar light), featuring Blade Wolf.
Source: Hideo Kojima Twitter