Hi Ivan54,
Glad you like the concept, and can adapt to the name, which feels right as a new component for your intranet that can bring together many communicaiton sites and team sites. It's common for people to call their sphere of activity at whatever level a XYZ Hub, XYZ Central, XYC Web - in fact our customer Shire calls their main company portal, "The Hub." Great minds, and we aim to be descriptive, where visually in the UI you can call it (at whatever leve) whatever you like ;).
Tackling your question:
- A hub site can be either like a team site or a communication site at its roots, and on top of that, it adds the common nav, cross-site search, consistnet theme, plus news and activity roll up (only roll up content a this time). We think it'll be most common to have a hub site be a communication site, but if you did use more of a team site approach, know that the hub site would get a new Office 365 group, which could be handy infomrational architrecture if planned for all associiated sites to follow that same persmisisons model from top down.
- "make this site a hub" checkbox was in an early build, and with the focus of hub sites being admin created, we do not think that will be in the final design.
- And Cc'ing Michael Lorentz for this one: a hub site cannot be joined to another hub site (I'll reply with a longer answer to that one beyond the "No" in this bulleted list).
Thx,
Mark