According to Dan Didio, as reported here, there never was a Crisis on Infinite Earths in the new DCU.
No Infinite Crisis, No Final Crisis. No Zero Hour and no Identity Crisis.
Edited to add: According to several sources, Identity Crisis is still in continuity. My mistake!
"I think that the idea that every comic (or even every #1) has to be totally understandable to a new reader is a terrible self-defeating myth. The only thing every comic book needs is the ability to bring the reader back for one more issue."
Someone should have told this to Jim "BECAUSE I SAID SO, DAMMIT!" Shooter. (heehee)
As it happens, my first Marvel was FF ANNUAL #3 (what a place to come in!!), while my first Spidey was ASM #55 (part 3 of 4-- and as I soon leanred, part 4 STILL ended on a cliffhanger-- as did the issue after that!!! Grrrrrr....)
On the other hand, here's the very 1st comic I ever had...