I believe you're able to choose to show the EXIF data on your photographs to others (although this isn't something I've experimented with, so as it stands you have to choose to show this - I can't recall if Flickr is the same for this). You can enable it on some/all galleries if you like.
With regards to the online community aspect, at the moment with the way I use smugmug it's literally it's own little island of a website, so I don't get visitors to my pictures unless I send people there. I've never used it differently so don't know if it's possible that it can be used in a similar way to Flickr in that you can search out different photographs and comment, or favourite pictures, that kind of thing. My guess would be that they'll do everything they can to maintain the online community that Flickr currently has, but I guess we'll see. Up to this point I've seen them as two different experiences; I go to Flickr to share photographs with absolutely anyone, see what other people are producing, that sort of thing. I go to smugmug to upload family photographs into a specific gallery and client photographs into different password protected galleries. Maybe Smugmug has always had similar functionality to Flickr but if they have it's not something I've used at all.
