Casio announced new GPS watch at Barselworld 2014.
Release date and price are not decided yet.
GPS LSI Circuit for GPW-1000 is redesigned from the one for Sony's smartphone.
For example, circuits for watch don't need so much capacity for information processing compared to the one for smartphone.
Then, that circuit is lower power
And, hybrid system is improved very much.
When you modify the time,
Get time zone.
Receive time zone information from GPS.
If you are located the place where the watch can receive radio wave. the watch can modify the time by radio wave not using GPS.
Because receiveg radio wave needs less electrical power that using GPS.
You can check the more detail here.