Very early reports (such as those from Kevin Russell and Tom Goldstein over at SCOTUSblog) indicate that there was not much enthusiasm among the justices for finding that the AIA deprives the Court of jurisdiction.
The argument apparently has just ended. The audio should be up relatively soon.
UPDATE: Lyle Denniston appears to agree that the Court is headed toward reaching the merits. You can find his first report here. Denniston writes: "The comments and questions of the Justices during the 89-minute exchange left the distinct impression that they are prepared to rule on the constitutionality of the mandate that individuals must buy health insurance, and not push the issue off into the future. The exact route they would take was a bit uncertain, but their skepticism about taking a pass was clear."
