I spoke too soon about SSI changes not being in the budget reconciliation bill. The legislative text is now available and it includes one SSI change (page 1682) -- extending SSI to U.S. territories effective January 1, 2024. However, a case pending at the Supreme Court could extend SSI to the territories a lot sooner than that.
Update to include some speculation: Maybe there won't be an oral argument in U.S. v. Vaello-Madero. Maybe an agreement was quietly made in that case and related cases. If the Biden Administration gets SSI for territories legislatively, the cases get dropped. That allows for an easier implementation -- giving Social Security almost two more years. (And I really think the government is going to lose this case if it is argued.) However, such an agreement would deprive claimants of benefits for that time period. That kind of deal is what I would have urged if I had been in the Solicitor General's office. I guess we'll see soon. The oral argument in U.S. v. Vaello-Madero is scheduled for November 9.