I think there's some room to experiment with various options as extensions, in beta, etc. The "pick something" stage is going to have to weigh a lot of competing objectives -- for UI building, for content templates, for scripting, visual editor support, etc. I don't see us getting to the "pick something" stage until a number of different implementations have been prototyped in different contexts. --scott
ps. Tyler: please play with the 'spacebars' implementation in https://www.meteor.com/ ; escaping can really be transparently correct if your implementation works with structured HTML, not just banging together raw strings.