A huge thank you to everyone posting in this thread - all very helpful in trying to estimate future nTP earnings (certainly better than MMB in most cases!). Simply astonishing that we need it for a simple and easy scheme...

A data point, a warning and two questions -

Data point: BAH with 5 nights' hotel booked before 30 December 2024, multi-city, BA marketed / BA operated - base nTP (oTP x 13.33) for each flight posted 72h or so after each flight. Double TP for the total flights (oTP x 13.33) posted 5 working days after final flight. This booking involved an involuntary change after 30 December 2024 (ticket re-issued but no change in price). GUF Club -> First applied before 30 December 2024, oTPs -> nTPs credited at Club rate. All as expected.

Warning: take with a pinch of salt, but I enquired with the GGL line about the nTP credit date/allocation for new BAHs (i.e. post 1 April 2025) that straddle a tier point year (e.g. depart 22 March 2026, hotels 22 March - 2 April, return 2 April 2026). The representative went away to check and then confirmed that all nTPs will post together and will be backdated to the last flight/item on the booking. So, in this case, the holiday would not accrue any nTPs in the 2025/26 membership year, and will only accrue in the 2026/27 membership year, despite the bulk of it (including a flight) occurring in the 2025/26 year. This could be a net positive or net negative depending on one's situation, but it's potentially a big change from BAEC for those close to renewal thresholds at year end.
Presumably this timeline does not include the Bonus Tier Points for flights which appear to be posting after each flight has been flown and are independent of BAH nTPs.
We obviously won't know the reality until April 2026 (will anyone still be in the Club then?)

Question: are we any clearer on what, if any, Bonus Tier Points accrue on AA operated US domestic flights booked on 125- after 30 December by someone who has registered for the offer? If there are Bonus Tier Points, do we think the 175 / 400 bonus thresholds for Business match the 40/140 oTP 2,000 mile thresholds?

Question: am I correct that no-one has yet succeeded in getting BA to honour oTP x 13.33 for non-125, non AA/BA/IB bookings, made before 30 December 2024?