Think they only said PHB ones were planned for. Although yeah I'd love to see SCAG ones (Bladesinger specifically!) and maybe some of the ones in Xanathars too. Some subclasses will be a lot more work than others though.
Like with Bladesinger - bladesong shouldn't require fancy new animations (although i guess it changing your animations technically would make sense), most of it's abilities would be just tweaks to what bladesong then did (adding INT to damage at level 14 etc).