We also use the word "looking forward to" at the conclusion of official letters and emails to express our desire to hear from someone or our expectation that something will occur. We utilize the existing simple form: I eagerly await your response. I'm hoping to hear from you shortly. The phrase is used in a similar manner to other expressions such as "keep up with developments", "watch out for changes", "be on the lookout for". It can also be used to indicate that someone has done something to deserve attention or reward. For example, his action was looking forward to hearing from you soon. Looking forward to means that one is excited about something - especially if it hasn't happened yet! If you want to sound more professional, try saying that you look forward to receiving / responding to his email.