This is a biplane so obviously it means it has two wings. This plane will be a delta wing version. The bottom wings are the same as the standard Skybolt but the upper wing is made in three pieces, with a wider centre section which allows greater fuel capacity as well as more weight due to the additional strength in the spars as their unsupported length is shorter. Of course the other benefit is that it will make the construction easier too.
Check out the details at http://www.steenaero.com/Skybolt/specifications_delta.cfm