According to a new announcement, the Wink Hub now has local control.
http://blog.wink.com/wink-blog/2016/2/10/local-control-now-available-for-wink-compatible-lighting-products
No word on API updates, apparently the smartphone app connects directly, so some reverse engineering might be required.
Who’s working on the Wink Hub binding? I’d LOVE to have Zigbee support, without needing The Cloud.