Our current plan is for 18 stories of no more than 7,000 words. That's 126,000 words, so the size of a fairly hefty novel. Of that we hope that at least 6 stories will come from Bristol writers and at least 6 from Caribbean writers. As we are having open submissions, we hope the remaining stories will come from all over the world.
We haven't specifically promised this in the project description because plans rarely survive contact with reality. We might get sent a really good 10,000 word story, or some great flash fiction. And finance-wise it is always hard to know what you'll be able to afford as different rewards have different costs so you don't know how much money you'll end up with. But it is what we are aiming for, and hopefully we'll get there.