I bought the TS3 partly because of its GPS feature. In the real world, shooting sometimes while riding or at quick stops, the GPS is too slow to acquire an updated position - so it's not much use. Next time I buy a camera I doubt I'd pay extra for GPS, although of course the newer TS4's GPS might be improved. Otherwise the camera is suburb in all respects including "toughness" (I've already wrecked two conventional p&s's).
Some additional thoughts: it does come with a USB cable for downloading, it does have a scene mode called "panorama assist" (never used by me), it offers a hi-def video mode (which is not readily emailable), and there's a 3D setting.
Panasonic has in addition to the new TS4 model a lesser model called TS20 - I'd take a close look at that.
Priors: '13 K1600GT, '08 R1200RT, '04 R1150RT, '05 R1200GS, '73 R75/5.