52 Samsung, the same source that recently leaked photos of the handset, has posted a hands-on video of the S4.
The clip highlights the battery, different SIM cards and various functions of the smartphone.
The device runs Android 4.2.1 and strongly resembles the Galaxy S3.
The Samsung Galaxy S4 is rumored to be equipped with a 5-inch Super AMOLED display with 1080p HD resolution, running on Android 4.2.1 and an eight-core processor running at 1.8 GHz and 2 GB of RAM.
Samsung will unveil its latest high-end smartphone on Thursday in New York.
Source: 52 Samsung