Samsung now hasn't yet announced pricing or specific release info, but it says that the handset will ship globally beginning in Q2, 2013. If you are going to get one and like watch videos on smartphone, Then I am sure that you can't miss this.

Tips about How to play MKV, AVI and other videos on Samsung galaxy s4

Attention: all of you can do it in the same way on other smartphones likegalaxy s3, htc one.

1. Download a video player on your phone
Download a video player on Samsung galaxy s4 is the simplest way in order to watch most of the common videos on the handset without conversion, anytime and anywhere.
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We can install video player like Mobo Video Player, MX Video Player, QQ Video Player or V Video Player on the Galaxy s4, as they all can play MKV, AVI, WMV, MOV, FLV movies and videos on the device. So when you know this you'll get it easy to play your favorite MKV or other formats movies or videos on your phone.

2. Getting help from computer
If you want watch videos of all kinds on Galaxy S4 like iTunes M4V movies (usually the .M4V movies on iTunes are DRM protected) or Xvid, DivX, RM, MTS, M2TS videos on the Galaxy s4, we aren't able to watch iTunes videos or movies on Galaxy s4 without authorizing. The key to make it possible to transfer iTunes M4V videos or other videos to the device is remove DRM from iTunes .M4V videos, and then convert the iTunes M4V movies or other videos formats to MP4 with H.264 codec by using a video converter.

Source from: How to play MKV, AVI, iTunes M4V Videos and more on Samsung galaxy s4