Kids. I'm gonna poke a hole in your no home button theory.
The invitation is a photoshop job.
Please note the following :
The calendar icon is in focus.
The other icons are not in focus.
The bubbles are in focus also.
if this were a macro zoom photo the bubbles would not be in focus.
And unless Apple can go forward in time the calendar icon shows a future date. Making it a Ps job.
Image
I'm a photographer and the depth of field is actually looking very consistent.