The upcoming phone is expected to be marginally smaller than its predecessor in all dimensions. It will measure 146.9 x 70.4 x 7.2 mm, compared to 147 x 70.6 x 7.6 mm.
The S25 will be quite similar, design-wise, to the S24, but it will come with smaller bezels (if these renders are accurate) and rings for the cameras on the back. The flat sides are here to stay, apparently - at least until Apple decides to introduce...
http://dlvr.it/TD914r