"Es" is used as a pronoun for every noun that is a "DAS" word (das Buch, das Auto, das Zimmer, etc.), but it is also used as an impersonal pronoun like in "It's raining" (Es regnet). Your two sentences seem to use the latter.
As for the first example, I find the sentence structure a little strange. I would simply say "Morgen wird ein neues Buch vorgestellt" (I wouldn't use "praesentiert" either).
The second sentence is correct as stated (Darüberhinaus waere es fuer mich interessant, .....zu machen ..."). You need "es" like in "it is interesting".