The Speedmaster 38

This is one of Omega's BaselWorld previews -

Courtesy of Omega

Known internally as "cappuccino", this model lives up to the advertising and measures in at 38 mm.

The case is of stainless steel and 18K gold (Sedna).

Under the hood is the Omega Calibre 3330 (Co-Axial).  All covered by a 4 year warranty.