Reminds me a bit of treesaverjs.com, which created automatic magazine-like page layouts for any size screen, but unfortunately seems to have run out of steam.
Do you plan on offering a complete solution for publishers including CMS integrations?
Compared to other platforms we're more about the user using a editor to create the content himself, rather than doing that automatically (like—for instance—Paperly). There is an import tool, but normally you'd want to use Papermine as a content creation tool, rather than an aggregator.
As for CMS integrations, right now we're focusing on getting the basics right. However, we do want to make it easy to create great publications: if integrating with any CMSes people use will help with that, we will certainly do it :-)