You should have gotten a preorder code emailed to you by Amazon. I'd contact Amazon if you didn't. Amazon.co.uk gave me mine.
It doesn't say anything about Angel City early tho just some cosmetic junk, but I assume it's those codes Respawn is going by for access. In manage game (xb1, not sure if you can do this on ps4), it says I have a file called "Titanfall 2 pre-order" installed which is 10MB.