One thing you could do is refer to your project by a codename (Longhorn, Snow Leopard, Project X, etc.) until you come up with a final name & specifically menti

One thing you could do is refer to your project by a codename (Longhorn, Snow Leopard, Project X, etc.) until you come up with a final name & specifically mention on your site that this is the project code name. Once you've decided on the final name (and domain name), you can then 301 to your new domain.