>I am looking forward to reading his book. O mejor dicho, no puedo esperar leer su libro.

Small correction. The literal translation of " I can't wait to read your book", does not work well (i.e. make sense) in Spanish. It would have to be rephrased to something like: "No me gustaría esperar para leer su libro" or more realistically "Deseo leer su libro cuanto antes" (or some such).