The upcoming feature phone is expected to hit the market in Q2 for around $100 USD and while its specs are far from today's mid-range, it will offer IP67 certification and a design that appears rock solid.
http://www.notebookcheck.net/Samsung-B550-Xcover-3-rugged-phone-leaks-online.138058.0.html
No GPS, no upgrade from B2710...
Nokia is still in the Feature Phone market, but their devices are not rugged and not certified with IP68 or waterproof. In that scenario, the rugged feature phones add more value to the safety of the device but usually cost more. PErsonally; i prefer AGM: their X1 is great in specs, materials and PPR --- just look up for reviews ... and now with their Gold 18k edition of the x1 ... well, is amazing!