It is the same forum that had posted a few purported shots of this smartphone and claimed that these pictures are of Samsung Galaxy S IV's dual-SIM variant, which will be available through China Unicom (A mobile operator in China).
There seems to be some similarity between the smartphone in the video and the teaser image posted by Samsung on its Twitter page. Furthermore, from this video it appears that Samsung Galaxy S IV has borrowed its design architecture from Galaxy Note II.
The video also indicates that Samsung Galaxy S IV will indeed come with a plastic body, as pointed out earlier in some of the leaks. More importantly, this video highlights that Samsung Galaxy S IV will come with removable back panel and hot-swappable microSD card slot. It also indicates that there will be 2,600 mAh battery powering the Galaxy S IV.
Just to recap, as per the previous leaks, the Samsung Galaxy S IV is expected to come with an Exynos Octa 5410 processor, which clocks in at 1.8GHz with 2GB RAM along with PowerVR SGX 544MP GPU. There will be options of 16/32/64GB for internal storage.
The Samsung Galaxy S IV is likely to come with 4.99-inch full-HD (1920X1080) display and run Android 4.2 (Jelly Bean) out of the box. There will be 13-megapixel rear camera on-board and a 2.1-megapixel in the front. Connectivity options will include Wi-Fi, Bluetooth 4.0, NFC and wireless charging support.
More recent leaks also indicated the presence of Smart features like Smart Scroll and Smart Pause, Black and White colour variants, new green PHOLED display technology, floating touch and a Photosphere-like function called Samsung Orb.
Samsung will be launching this smartphone at unpacked event that is taking place in New York on March 14. The company has been teasing the launch of this event through various tweets and videos.