Rumors and leaks surrounding Samsung's next-gen Galaxy S4 smartphone are gathering momentum with each passing day in anticipation of the device's purported launch in early 2013. Now, a hands-on video that shows the Galaxy S4 in action has surfaced online.

The Galaxy S4 video is nearly two minutes long and gives a peek into the "most thinnest" Galaxy S series smartphone to date that has a laser keyboard in tow. However, before one jumps to further conclusions, this video features a mock-up Galaxy S4 in action. The video is not official and is an amalgamation of existing rumors and speculations and, therefore, should be taken with a pinch of salt.

According to Rozetked, who posted the video, the Galaxy S4 or GT-I9500 would be "ultraslim" and sport a 1080p Grand AMOLED display. The "lightest" and "powerful" smartphone from Samsung will also have a 2GHz quad-core processor and a 13-megapixel rear-facing camera.

The video claims that the Galaxy S4 smartphone from Samsung's Galaxy S series is "the most thinnest one, much thinner than Galaxy S3 and iPhone 5." The Galaxy S4 will also pack in the latest Android 5.0 Key Lime Pie OS and will have a "projection laser keyboard dock included."

The video ends with an interesting text "Samsung Galaxy S4 is build [sic] of the leaked drafts. Thanks Taemin Lee," which hints that the authors of the video may have gleaned the details from an official source.

With the alleged release of the Galaxy S4 not too far away, it will be interesting to see if the mock-up video lives up to the final device, especially the laser keyboard bit.

Check out the video below.