Hey {FirstName},
It’s {your name} here with an important announcement.
How would you feel if I told you that I could {insert the major feature of your product}? Honestly, it's possible, and I'll be releasing a brand-new product in two weeks that will walk you through the process.
I wanted to give you the heads up because there will be a great early bird price and excellent bonuses. I'd hate for you to pass these up!
You can download this brief report, which explains how and why [insert your product] will help you tremendously, in the meanwhile. This will blow your socks off, I guarantee it. I'll be announcing some extra perks and discounts on the day of the launch and maybe in the days running up to it, which is {insert time and date}.
Speak soon,
{your name}