Feature requests and future roadmap are maintained on servicestack.uservoice.com.

We particularly see solid support for hosting on Linux (with Mono) as one of the key areas providing the most value to our users as it's the preferred deployment platform for most large Internet sites and Startups as it allows companies to scale at $0 software licensing costs (a key requirement for scaling horizontally) as well as Linux servers provides the cheapest hosting, e.g. we run all of servicestack.net on a single dedicated Ubuntu server with 2GB RAM, 80GB HDD, 100MB bandwidth with 4TB traffic for only 19.90 euro per month. - an equivalent configuration on Azure would cost over 10x as much at USD $3,560 per year (Reserved instance, only 1.75GB RAM, 2TB bandwith, No DB inc) - Scaling horizontally at that price starts to hurt budgets very quickly.

Even if you don't intend to host on Linux / Mono, it's still a good idea to build with cross-platform technologies where possible so you always have the option available should you need to scale-out fast - taking advantage of other platforms where it's not financially prohibitive or legally restrictive to scale horizontally.

• ServiceStack OWIN support sneak peek by @randompunter