Looks like a very interesting project which I'll keep a keen eye on. We're probably not ready to switch our entire stack from Mesos to Lattice though, especially considering you're missing some important bits such as external service discovery etc. (by the looks of it) We're currently doing Marathon on Mesos with gliderlabs/registrator which syncs Docker and Consul - and then we're using consul-template + HAProxy for exposing applications externally. Works quite nice.

The differences (and advantages) between Lattice and Mesos could've been made clearer too I guess, although your docs and FAQs are quite nice.