The specific changes include:

Source Engine

    Fixed Garry's Mod servers not being listed in game
    Added cvars to let the server prevent clients setting unreasonable network settings: sv_mincmdrate, sv_maxcmdrate, sv_client_predict, sv_client_interpolate, sv_client_interp, and sv_client_cmdrate_difference
    Added protection against servers manipulating the cl_restrict_server_commands cvar
    Allow servers to execute the "play" command on clients
    Added an interface to allow servers to query most cvar values on the clients
    Added the IP address of the machine executing an rcon command to the server logfiles
    Fixed spectator relaying in SourceTV
    Removed cl_cmdbackup

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