Update, 3pm EST Thursday: SpaceX is loading its Starship SN9 prototype with propellant on Thursday afternoon. That much we know. But whether this is for a "wet dress rehearsal," a static fire test, or an actual launch, who knows.
After the FAA said Thursday's launch was canceled at 11am local time, SpaceX founder Elon Musk replied with the following unhappy tweet:
Unlike its aircraft division, which is fine, the FAA space division has a fundamentally broken regulatory structure.
Their rules are meant for a handful of expendable launches per year from a few government facilities. Under those rules, humanity will never get to Mars.
— Elon Musk (@elonmusk) January 28, 2021
Then a couple of sources suggested that Musk and the FAA were working to try and get final approval for a launch on Thursday before the window closed at 6pm CST (24:00 UTC) in South Texas. New Temporary Flight Restrictions have not been put in place, but propellant is being loaded. So we really don't know what to expect. Stay tuned.