Its no secret Van Buren will be a hybrid between Turn Based and Real Time, can you clarify for all the thousands of Black Isle Studio fans reading this, the reason for making it a hybrid as opposed to one or the other?

TB is a niche that most publishers are unwilling to mine with what is supposed to be a "Triple A" title. Publishers generally cannot be convinced that it will sell well enough to justify the money put towards the project.
Publishers almost always want RT in games. If a developer tells them, "Well, we can only do one or the other," RT is the option they will pick. Given the choice between having a RT and TB component at 80-90% of their potential or RT at 100% without any TB component, we'd rather have the former.