Much later than that. They haven’t even started discussing an e-edition contract with me, much less beginning production. I estimate (very roughly and out of the blue) that an e-version will arrive a year after print. Insofar as I ever have any ability to, I shall try to accelerate that outcome. But right now I am not optimistic.

Not exactly. That would be too tedious (and not terribly useful). Ancient passages relating directly to historicity (e.g. in Josephus, Tacitus, etc.) are in the subject index. Everything else is in the NT, so covered by the scripture index. The only other things that matter are modern authors (for which there will be a separate index) and ancient authors and persons mentioned in the main body (and not just in notes), which are in the subject index (likewise places that matter).

Theology ex: most historicists propose a low christology (Q) evolving to a high christology (John). Your model is I believe high christology (Paul) followed by lower (Mark) followed by higher (John). It would be helpful to see these models lined up in sequence to highlight their differences.

Consensus
Consensus, argument from (see also, Authority, Argument from and Populum, Argumentum ad)

Zombie, Invasion of Jerusalem by (Not)

Geza Vermes was mentioned earlier, but I’d like a separate index citation to “Dead Sea Scrolls” [even if it redirects to a more appropriate entry, like “Bible, early manuscripts” or some such].

Essenes
“Teacher of Righteousness”

John Dominic Crossan (as a popularizer of the idea we can “know” the “historical Jesus” he might be in your book; alternatively “historical Jesuses, conflicts between” might be even better than simply listing the popularizers)

Masada
Second Temple, destruction of
…I’m rather hoping these events are mentioned in setting the stage for understanding what the political environment was, so that we can better understand the context in which people might feel motivation X or undertake action Y.

other things I wanted were already covered, but include things like Maccabees (the book and the family and revolution with which they are associated), John the Baptist, Q, Saul/Paul, Bart Ehrman, Avalos, Tacitus, Pliny, Josephus, etc.)