I'm looking forward to this for several reasons. First among them, though, is being able to see the family life of the Araragi's. Specifically the siblings, though I wouldn't necessarily mind if a parent showed up.
Regarding the pictures, the short-haired Hitagi is easy to see that it's the same person, but Tsubasa less so. The other two even further. But Hachikuji will never change.