According to the wiki, the GPS is only present in the 3g version.
The device also features a rear touch pad, a front camera, a rear camera, stereo speakers, microphone,
Sixaxis motion sensing system (three-axis
gyroscope, three-axis
accelerometer), three-axis electronic compass, built-in
GPS (only for the 3G version)
However, Amazon lists it as such:
- Network connectivity via improved Wi-Fi capabilities (Wi-Fi and 3G connectivity available in an additional Vita model)
- Location based gaming allowing players to find and meet friends virtually for brand new experiences
So, we really don't know yet. Sony's website doesn't distinguish between the two models in regards to GPS capabilities.
Location
Built-in GPS
Wi-Fi location service support
http://us.playstation.com/psvita/tech-specs/
Further blurring the lines lol:
http://www.vitahq.com/Sony-PS-Vita-WiFi-1.html
Technical Specifications
• CPU - ARM Cortex-A9 core (4 core)
• GPU - SGX543MP4+
• External Dimensions - Approx. 182.0 x 18.6 x 83.5mm (width x height x depth) (tentative, excludes largest projection)
• Touch Screen - 5-inches (16:9), 960 x 544, Approx. 16 million colors, OLED Multi touch screen (capacitive type)
• Rear Touch Pad - Multi-touch pad (capacitive type)
• Cameras - Front camera, rear camera
• Game Media/Storage - New dedicated flash-based game medium; dual slots, one for the new game medium, the other is for storage media to be utilized for personal content and download content
• Sound
- Built-in stereo speakers
- Built-in microphone
• Sensors - Six-axis motion sensing system (three-axis gyroscope, three-axis accelerometer), three-axis electronic compass
• Location
- Built-in GPS
- Wi-Fi location service support
• Keys / Switches
- PS button
- Power button
- Directional buttons (Up/Down/Right/Left)
- Action buttons (Triangle, Circle, Cross, Square)
- Shoulder buttons (Right/Left)
- Right stick, Left stick
- START button, SELECT button
- Volume buttons (+/-)
• Wireless communications
- Mobile network connectivity (3G)
- IEEE 802.11b/g/n (n = 1×1) (Wi-Fi) (Infrastructure mode/Ad-hoc mode)
- Bluetooth 2.1+EDR (A2DP/AVRCP/HSP)
• Battery - Internal/embedded (not removable)