we've got content ready, just making sure we knew we'd have people to send it to (instead of just a few groups of startups).

Well why don't you make some content available and then people will see what they're signing up for. If you've already got it then this is zero effort for a higher conversion.

FWIW I've flagged this because at the moment you're 'showing' HN nothing but a Mailchimp form. This is a sub-MVP.

it'll be a nice resource for hackers! will post content soon, need to polish some

From your point of view it's a success - there's clearly interest. Put some content on the site, resubmit it. The audience is clearly there. Email me when you do and I'll be the first to upvote it.