Sneak preview is a term used to describe an exclusive preview of a product or event. It is usually done to generate interest and excitement before the official launch. The two crossword solutions for this term are 'PEEK' (4 letters) and 'PROMO' (5 letters). PEEK is a verb meaning to take a quick look at something, while PROMO is short for promotion, which is the act of publicizing or advertising a product or event.