From what I read on an article about notifications here, they were going to do something that meant you still had to ask Alexa to tell you your notifications, which would build up throughout the day and cause your device to light up and chime to let you know you had a notification to listen to.
Rather than allowing Alexa to randomly blurt stuff out any time she feels like it.
Which kinda seems pointless if you don't get the notification at the exact time it was sent, for example a smart home connected device triggering an alert to let you know you left your door open too long or the app automatically reading you the weather when you get up and turn on the coffee pot in a morning, things like that. If you have to ask for the notifications you may as well just do the speaking and request stuff from the beginning.
Maybe I'm wrong but that's how it reads to me.
Surely we want, with opt-in permission per skill, to allow Alexa to just say whatever she likes whenever she likes from the skills we have set up receiving such commands, without us having to say oh I see I have notifications let me ask what those are.