There has indeed been talk for a few weeks of an ultra-thin model in Samsung's Galaxy S25 range, rumored to be announced at the end of January. Rumors recently corroborated by other "leakers".
Samsung Galaxy S25 Slim, main specifications££££
The famous Ice Universe thus claims that the thickness of this Galaxy S25 Slim will be a little less than 7 mm, compared to the thinnest Galaxy S24 which measures 7.6 millimeters. The iPhone 17 Air could display 6.25 mm thickness. Ice Universe also anticipates a high-quality camera module, an astonishing feat for such a thin device. Another "leaker", Debayan Roy, provides details on this subject: 200 Mpxls main camera (Isocell HP5), 50 Mpxls ultra-wide-angle (Isocell JN5) and 50 Mpxls telephoto lens (Isocell JN5) with 3.5x optical zoom.
Samsung Galaxy S25 Slim, lithium-silicone battery££££
He also mentions a Snapdragon 8 Elite processor (the same as for the other Galaxy S25) and a battery whose capacity would vary between 4,700 mAh and 5,000 mAh, probably a lithium-silicone model with a high density for a reduced size so as not to sacrifice performance.