You have to wait. It takes weeks for KS to process all payments and get the list of emails of backers and associated pledge amounts and then it depends how long it takes them to set up a pledge fulfillment site. It might take a month or two but I think it will be up and running before Dragon Commander is released in July.
I got the anthology as an addon and given I've only ever played(and loved) DKS out of the Divinity games you can imagine I too am excited to play all the games but I'm willing to wait a few months. I'm actually toying with the idea of playing all the divinity games in chronological order but I have to admit I'm not sure whether D:OS happens before or after DC lol.
