We've had a quite a few requests from people wanting to join the campaign as late backers. We also have around 20 backers whose payments have not been successfully collected by Kickstarter who have been automatically dropped by the system.
In the past, to deal with these issues I've been happy to collect manual Paypal payments from people. However, given the scale of this project, it is not really workable and would probably lead to problems when it comes to the fulfilment stage.
To solve this I've set up 3 preorder products that essentially duplicate the Level 3, 4 and 5 rewards. The only differences being that they cost 10% more, and do not include access to the beta document. These preorder products will available until the project survey deadline (surveys haven't gone out yet), which will be in early August. Preorders will be posted after the Kickstarter rewards, but before the Second Edition products go on general sale. Any preorders that also include general stock products will be held until the preorder items are ready for dispatch. There are no add-on options for these preorders.