Well here’s my list, I see
@0989382 already made a pretty good dent in it. Maybe I’ve forgotten something, not sure:
4GB RAM (increased from 3GB), better camera with a new sensor, new image signal processor, various improved picture and video modes, better display, improved sound, IP68 water resistance (vs. IP67), dual SIM capability, faster FaceID, faster wireless charging, up to 15% faster CPU, up to 50% faster GPU and the machine learning neural engine co-processor goes from 2-core/600 billion operations per second to an amazing 8-core/5 trillion ops/sec—over 7x faster.
Also: stronger glass, better battery life, stereo video recording via four microphones, more frequency bands, including T-Mobile's 600 MHz LTE Band 71, and a faster “gigabit class” cellular radio. (In tests on US cellular carriers, the average download speeds more than doubled and upload speeds increased by 50%.)
Some will upgrade just for the gold color lol, and a 512GB SKU is now available as well, for those who need half a terabyte of storage on their phone. For those who miss the Plus size, for only an extra $100(!) they can get the XS Max.
Almost no aspect of the X feature set was left untouched; it’s really quite amazing. It was the best iPhone Apple ever built, until the iPhone 11 is introduced tomorrow.