There are many complaints about the delay of the Oculus Rift. HTC shows how it can be done and has started shipping the Vive today. On Reddit people confirmed this with screenshots from FedEx. From the screenshots we can see that the HTC Vive will be sent from Taiwan and will arrive April 5.
Confirmed countries are Australia and Canada. The shipping method looks similar to the shipping method of the Steam controller. HTC is shipping the items based on the estimated shipping time so the package will arrive on launch day.