The vivo S15 and the vivo S15 Pro are expected to arrive in China this month. The phones were already 3C certified with model numbers V2199A and V2203A, and the former, presumably the vanilla variant, is also on TENAA with full specs but still no photos.
According to the listing, it will be powered by a 3.2 GHz CPU that comes with the Snapdragon 870 chipset.

The vivo S15 will have a 6.62-inch AMOLED screen with 1080p resolution. There is a camera on the front with a 16MP sensor, while the main configuration on the back is 64MP + 8MP + 2MP. There will be a 12GB RAM and 512GB storage option, but no word on a micro SD slot.
The battery is listed as 2,290mAh, which is likely one of the two cells, meaning the minimum charge is 4,580mAh, while the typical one could be between 4,600mAh and 5,000mAh. The 3C listing has already confirmed the fast charging capabilities of 80W via cable.

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