First of all, I apologize for the delay in answering your question - unfortunately, proper notifications have not been set up in the HBP Forum, so we discovered your question only two days ago.
I thank you for your interest in our work. Although I sincerely hope that, eventually, our modeling work will be relevant to your research, I note that this is very much work in progress, and it is also seen as a community enterprise, so the pace (and also the direction!) of development will depend very much on input from people outside the Human Brain Project.
I should also point out that, although the ultimate aim of the HBP is naturally to model the human brain, we are currently developing and testing our tools mainly on the use case of the mouse (and rat) brain, where, in most domains, much more data are available. However, more and more work on modeling the human brain can be expected in later phases of the project.
To answer your questions more specifically, we started modeling on the CA1 subfield, but we are now extending it to CA3, the DG, and even CA2 (of the mouse and rat). We will first focus on intrinsic hippocampal connectivity (and we are working in 3D, so that should also include longitudinal fibers), and will later add extrinsic connectivity, eventually in the form of directly interfacing with models of other parts of the brain (entorhinal cortex, prefrontal cortex, thalamus, medial septum, etc.).
Please let us know if you have any further questions or comments - as I said earlier, we are trying to develop tools (and models) that are useful for the community, so feedback is essential for us.
Laboratory of Cerebral Cortex Research
Institute of Experimental Medicine
Hungarian Academy of Sciences
H-1083 Budapest Szigony utca 43.