[xytop]

I'm not Lisp guy.. Please tell me what's that new syntax means in that context?

I see it as just new functions, not language extension.

[qwertyuiop924]

They're not functions, they're macros: functions that are called with their arguments unevaluated, and return code to be evaled in the environment of the call.

[PuercoPop]

You can view macros as functions that run at compile time and that take code and return code instead of values