Yes, you will. Pro is mostly the proper configuration/setup, but will of course come with all the add-ons and perhaps some additional services we want to scope in (maybe hosting or audits, for example). Pricing is least of my concerns, Im just working on the product at the moment and making sure its the best I can do.
Regarding Topics though, as it stands we aren't sure if we're going to release it. If we do, it may be under special terms. The reason is that it is essentially a replacement for nodes. We aren't sure what its going to do across thousands of forums, so that one alone may be on a 'contact us' basis or something for the short term. Its done, and going to be sent to beta team people tomorrow.
Besides, UI.X Pro is claiming to be the ideal forum experience. And for existing forums, Topics may not be ideal. User won't be used to it, and it may cause confusion. For new boards, it may be quite a bit cleaner of an experience. Topics is first and foremost a UX improvement, despite it needing to integrate in XenForo in various ways that required back-end changes. But the realistic nature here is that we won't be requiring it for UI.X Pro if people do not want it (and won't be recommending it for large existing forums)
TLDR is I dont know if Im releasing it and at what cost. If you want to beta test it we could use the help!