It's hard to see a trademark complaint succeeding. Checking with swissreg
Schweizerische Bundesbahnen SBB (the Swiss Federal Railway Service) has trademark registration 512830 filed March 9, 2002, International trademark class 14 (jewelry), Uhren und deren Bestandteile (watches and parts thereof), and it's a 3-D mark.
iDevices aren't ordinarily jewelry, although you could wonder about an iPod on a watchband. The iOS 6 images being shown off are two dimensional screen representations. A cautious SBB could have registered it in multiple classes (e.g. Class 9, Class 42).
You'd expect they registered it after being contacted by Mondaine about making a watch. It would seem Apple is using it in Class 9 and only as a two dimensional image. Personally I'd hold the lack of an aluminum case in a software app against SBB here. A software application isn't a chronometric instrument certainly not comprised of precious metals or coated therein.
You'd think if they ran off and hurriedly registered a copyright they'd have much better success.
CLASS 9 (Electrical and scientific apparatus) Scientific, nautical,
surveying, electric, photographic, cinematographic, optical, weighing,
measuring, signaling, checking (supervision), lifesaving and teaching apparatus
and instruments; apparatus for recording, transmission or reproduction of sound
or images; magnetic data carriers, recording discs; automatic vending machines
and mechanisms for coin operated apparatus; cash registers, calculating
machines, data processing equipment and computers; fire-extinguishing
CLASS 14 (Jewelry) Precious metals and their alloys and goods in
precious metals or coated therewith, not included in other classes; jewelry,
precious stones; horological and chronometric instruments.
CLASS 42 (Computer, scientific & legal) Scientific and technological
services and research and design relating thereto: industrial analysis and
research services; design and development of computer hardware and software;