Clicking the camera icon still gives me that film strip with all of my photos, so not sure why it's gone on yours.
Also, clicking Details gives me the options you mention, along with turning on Do Not Disturb for that thread, and scrolling further shows the Attachments made in the thread (pictures sent, etc.)
I noticed that feature this morning on my iPad (I'm not brave to install iOS 8 on my only phone). Pretty cool. I like that you can swipe thru your camera roll.