I'm from Torchbox, the UK agency who created this CMS. We launched Wagtail here on HN just over a year ago, and are currently preparing to release version 1.0, whose headline feature is 'StreamField', our attempt to handle the old CMS dilemma of editor flexibility versus structured data:

https://torchbox.com/blog/rich-text-fields-and-faster-horses...

It's been an exciting year for us, but we've seen a significant increase in interest in the last couple of months, with a handful of household names adopting Wagtail, including one particularly high profile site which we hope to be able to talk about soon.