Pre-ordering a phone with Verizon?

[DWS44]

Possibly switching to Verizon (from Sprint) with the S6 coming out. How does Verizon typically handle pre-orders, specifically with respect to a new customer signing up for new service? Are pre-orders reserved for existing customers, or do they typically allow new customers to pre-order as well?

Just wondering what to expect when I try (or if I should bother).