How many apps truly take advantage of iOS 7?

It's been a month now and honestly all I'm seeing are apps with visual makeovers, and almost none (apart from very few) taking advantage of new multitasking APIs. New Twitter app doesn't do it, Facebook doesn't do it either.

I'm most waiting for IM apps to take advantage of push triggers where it updates the app in the background when a push notification is received. This one is badly needed and it would be very disappointing if Facebook Messenger, WhatsApp and Viber amongst others don't implement it.