Got this from Ticketmaster re the Wembley show:

Just a few details about dispatching your tickets...

The event organisers are still working with us on a few final details before we can print your tickets, but this might not be until nearer the time. As soon as this is completed, we’ll print them and send them out to you. The latest you should receive them is around 5 days before the event.

Reading between the lines...might this be new album/tour branding related?