I used it for the first time since the major upgrade. The interface and layout are big improvements. I will be using this app more often.
So what are the improvements? You now can choose the layout, you then add your images then you may also attach videos. The videos are not apart of the main picture layout, but are added after the main picture layout. You may still add audio to the Blurb. The audio plays with the main picture layout. I am not certain if you can add more than one picture layout and more than one audio.
I may edit my new Blurb today to test if those are options.
Give Blurb Mobile a try!