While not set in stone, rumor on the street is the BlackJack won't be getting a Windows Mobile 6 update until 3rd quarter. An industry source states the BlackJack won't see an update until sometime "after June."
T-Mobile's Dash received their update last week though no information on an update for AT&T users has been released yet.
What can AT&T users do in the meantime to get their ROM updating fix on? There's a minor update available directly from Samsung that will improve roaming capabilities.