[farang]

there is an easy way to solve your problem.

Just take one of the new Commands, and see if it it's existing...

if (SomeBlizzCommand) then
	DEFAULT_CHAT_FRAME:AddMessage ("Command exists, therefore we can use it!")
else
         DEFAULT_CHAT_FRAME:AddMessage ("Command dosn't exists, damn!")
end

Of course you need to replace "SomeBlizzCommand" with a real new 1.7 command/function