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.
RE: Announcing the Launch of Hive Blockchain