Panasonic S1R full frame system camera specifications: with a variable ND filter?

The Dutch store Kamera Express has listed the following specifications for the upcoming Panasonic S1R full frame mirrorless camera - some of the specs were not mentioned in the official S1 and S1R information released by Panasonic:

System camera with 47-megapixel full-frame sensor
High-quality Leica L mount
Built-in Dual IS image stabilization
4K video with 60fps and internally variable ND filter
Double card slot: SD and XQD
150-megapixel Pixel Shift mode
Robust, super-fast and silent shutter
100% splash-proof and dust-proof housing and suitable for use in extreme temperatures
Built-in WiFi and NFC