that's what ... is about
That's what I was talking about.
Así que de eso es de lo que hablaremos hoy.
So that's what we'll be talking about today.
— ¡Que te den profe! (2013)
De eso es de lo que estaba hablando.
That's what I was talking about.
De eso es de lo que quería hablarte.
That's what I wanted to talk to you about.
De eso es de lo que estoy preocupado.
That's what I'm worried about.
That's what it's all about.
Y de eso es de lo que quisiera hablar.
And that's what I'd like to talk about.
That's what I'm talking about.