I think they always offered it in all black just not as popular.
Nope, it was first offered in two tone and full stainless. Then along comes the two tone with laser grips. They added the DC and DC with laser grips at a much later time. Which is probably why they're not so common. This is the first thread I've read on the DC model and went to the site to verify they made the Solo in all black.
I've been interested in the SOLO too, but have you seen the Kimber micro compact? It might have changed my mind.