Yes, it’s indeed a good expectation. However, I seriously doubt that all your wishes will be fullfilled.
IOI is currently working on a new game (007 Project), so most of IOI members are likely working on this game. A reduced team is still working on Hitman (patch) and actual new maps release is very unlikely to happen.
Sarajevo Six: In an IOI monthly, Travis already mentioned that Sarajevo Six won’t appear in H2 and other platform. I doubt that IOI changes its mind for H3. Moreover, Sarajevo Six is said to be an exclusivity for PS. I don’t see any sign (currently) that could change this.
ET: To date, we still have no indication on the changes to ET system. Let’s hope we get information on them with the patch scheduled tomorrow and the release of the first ET for H3 cycle. Like you, I would like the introduction of permament ET missions (like the Undying). It would be a great waste if IOI dumps them. Time will tell…
However, new missions on modified maps is conceivable