While Tizen/MeeGo has long played with Wayland as an experimental display server, with Tizen 3.0 in 2014 Samsung will be switching to Wayland instead of running an X.Org Server. They will also be switching to native 64-bit builds and making other major changes with Tizen 3.0.
The core operating system and tool-chain for Tizen 3.0 is expected to be updated. With that will also come Tizen 64-bit support, which makes sense since by the time of Tizen's 3.0 arrival there should be ARM64/AArch64 devices available in the market.
Tizen 3.0 is also expected to add protected multi-user support, a new 3D user-interface framework with a new rendering engine, a dynamic animation library, a Wayland-based compositor, and the Crosswalk HTML5-based application runtime using the Chromium/Blink engine. Tizen is going with a Wayland-based compositor as it's a "simpler replacement for X" and a "light architecture, better performance, smaller footprint."
These Tizen 3.0 details were shared during the Tizen Developer Summit in Seoul, South Korea. The Tizen 3.0 slides are available via TizenExperts.com