Chat Heads for any app

Not sure if anyone's interested but I just noticed the guys over at XDA are working on an app which does chat head/halo like notifications but for any app not just Facebook Messenger. Not sure what the rule's are on linking to xda so I haven't but this is the vid they posted from there

Looks cool to me I'd love to give it a go with PIE once it's out.. What do you guys think? Did Facebook actually innovate something cool on Android..