In short, Wayland is a protocol for graphics.

It's somewhat similar to X, as its main purpose is the same, however the archivecture is very different, and Wayland is much simpler/barebone.

If X is going to die or not — only time will tell. For now it can be considered another competing standard.

Some additions:

S-Tier

A-Tier

• RevTT (RTT) - Scene/General

B-Tier

• Cinemageddon (CG) - Movies
• Karagarga (KG) - Movies

C-Tier

• Metal.Iplay (RMT) - Music
• Pedro's (P*) - Music
• Exigo (E*) - Music
• LzTr - Music

D-Tier (Avoid)

• IPTorrents (IPT) - General (why?)