The announcement on Reddit also says they are changing their privacy policy to remove support for 'Do Not Track' https://www.reddit.com/r/announcements/comments/6qptzw/with_...
I would also suggest using Privacy Badger from EFF.
> DNT is a nice idea, but without buy-in from the entire ecosystem, its impact is limited. In place of DNT, we're adding in new, more granular privacy controls that give you control over how Reddit uses any data we collect about you.
What does it hurt to keep supporting it? It's actually pretty ironic: "DNT doesn't have total support across ecosystems, so we stopped supporting it".
[1] http://preferences-mgr.truste.com/ (one of many such opt-outs)
It will be a real shame if they start gunking it up with trackers - many news sites are basically unusable without ad blocking.
Will they be opt-out? You betcha! Still, at least they exist...