I had e-mailed MR a few months ago about this and they replied that this was still going to be coming out, but that they were pushing their other merchandise first. They wouldn't confirm a date, but gave me a 'soon' reply.
Can't wait to get one or two sets. My current 11.5g set needs to be replaced and this would be the perfect set to do so. Any word on how many will be in a set (300? 500?)