No official word, but here's what the rumor sites are saying
http://stoked.com/blog/3413/gopro-hd-hero-4-specs/
Here's what the GoPro HD Hero 4 will be able to do:
4K Ultra HD H.264 Encoder
- Film in 4k resolution at 30fps
- High Profile with B-frames for high efficiency
Super High Frame Rate Modes
- Film in 1080p at 120fps
- Film in 720p at 240fps
Advanced Imaging
- 700Mpixels/s oversampling performance
- Multi-exposure HDR and WDR tone mapping
- Electronic image stabilization (EIS)
- Improved MCTF with advanced sharpening
Wi-Fi™ Connectivity
- Remote viewfinder, playback
- Upload pictures and video to social media