Ask HN: Is it wise to create pre-launch/coming soon page for future product?

I've been working on a product (a web simulation game of sorts) for some time now, and I have a soft deadline that I set for myself to launch it. That date will be between 1st and 15th of June. I'm wondering, is it smart to create some kind of coming soon page, where people can leave their mail and be notified about it?

Also, if that would be the move, how much would you reveal on that 'coming soon' webpage? Would it be a logo and a 'signup' box with something really vague, like a tagline, or more?

I have the whole landing page already made, with a value prop written, few examples and what the product is about.