Hope, they sell it to Joshu or somebody who really cares
You can subscribe to bookmarks from other people (only if you already know their logins) and you can send bookmarks to others (using a weird for:nick meta-tag). Both features seem a bit sketchy by today's standards. This was definitely a breakthrough when Delicious was launched, but nowadays people expect more from a social site.
Not that I care about social features. I didn't miss them in Delicious, and I don't miss them in Pinboard. But it just doesn't sound convincing to brand Delicious as a great social product for Google to acquire.
Or at least that's what I was thinking before the example of Google Videos and YouTube came to me.