The history of these two accounts will be the same, but from the snapshot point onward, the accounts will be independent from one another. Actions you take on one network will not be reflected on the other. This means that future content and transactions will belong to whichever account you use.
What happens with the "recovery account" that is pointing to @steem on most users. For the HIVE fork will you change the default recovery account to some other default account? I see a potential problem if not.
What about folks that just changed, are in the 30 day waiting period, to a new recovery account?
Lots of people like me got alarmed when Sun took over Stinc and wanted a new recovery account.
the most reasonable thing is that they set the default recovery account to null in the fork.
Leaving people without a recovery account during a complete transition from one blockchain to another is flirting with disaster. Thousands of accounts could end up unrecoverable if there's anything that goes wrong at all.
That's not a reasonable course of action. It's potential suicide.