Minecraft wiki entry for Development_versions, associated text: MC-11713 – Unintended debug output to console if .minecraft does not exist.
MC-13711 – Icon in the taskbar shows LWJGL default icon while loading Minecraft.
MC-13870 – New launcher fails to launch on certain linux setups.
MC-14035 – New Launcher 0.2 not starting on OS X.
MC-14460 – no lwjgl in java.library.path.
MC-14513 – The new snapshot doesn't run under Linux.