sorry for being cynical ... but , should i be impressed?
Blog systems/ CMS are dime a dozen. Can you explain why should I or anyone in fact pay attention to this platform?
the key here is Meteor; sure you can go with Jekyll and a bunch others for Rails and Node, for instance, but there is no blogging platform with momentum for folks who want to customize using their Meteor expertise. Granted it's still a young platform, but it's always good to see early, pioneering efforts like these.