I know I'm in the minority when I say this, but I tend to like Google's ventures into the social realm. Sure, they don't always take off as they planned -- remember Google Wave? -- but every time Google comes into the picture with a new social app, I feel like the landscape of all other social apps shift just ever so slightly towards something they introduced (even if theirs doesn't necessarily get popular attention).
Anyway, Spaces, while not entirely new, feels like a new way to do social with small groups. My family and I already use Telegram for this mostly and for now that is more than sufficient, but Google's aesthetics might win me over even if the functionality is more or less the same. We'll see. The Spaces product launches presumably with Google I/O 2016.
PS: MATERIAL DESIGN!