OLED iPhone 8 might be available in three storage options that is 64 GB, 256 GB
and 512 GB.
iPhone 7 and iPhone 7 Plus that has been offering 32 GB. Also the high end
model might get doubled to 512 GB on iPhone 8 where the iPhone 7 and iPhone 7
Plus is limited to 256 GB as of present scenario.
iPad Pro models so this might hint that iPhone 8 could also be integrated with
512 GB storage option.