https://www.cnet.com/news/samsung-galaxy-note-9-promo-video-may-have-leaked/

The video -- one of those advertising spots that highlight a couple of features in a product -- included information about the possible storage configuration and battery life of the upcoming phone. It proclaims the device is "1TB ready" with a microSD card and "all-day" battery life. 

Given that the first 512GB microSD card, from PNY, shipped in June (and still seems to be the only one), that implies the Note 9 will have a configuration with 512GB. It might also indicate that Samsung, which also makes microSD cards, will be announcing a 512GB card as well. If so, hopefully Note 9 buyers will get a discount; the PNY card costs $350.