First, thanks @nicole.faerber for the detailed progress update, and kudos to Purism for being transparent on the issue.
I have to say, I’m not surprised. I always expected some delay, and a year ago even suggested that I’d rather wait some more months than going with i.MX6. Seems like that’s exactly what’s happening 
On the plus side, they’ll have ~3 more months to improve the first impression (especially for media/reviews).
On the minus side, maybe customs will turn out to be more difficult for the British. 
On your question, @eagle: I also noticed it’s a bit fuzzy about production / shipment. But what do you expect? The listed factors are not in the Hand of Purism, so they cannot give a guarantee. If production starts April 1st, maybe shipment starts April 30th. But if production starts end of April, shipment is in May. There’s still the possibility that production starts before April.
They are just trying to give us a realistic time frame. I appreciate that a lot 