1861 Speedmaster early next year?

That might be your OB's experience but it certainly isn't the experience of some owners on this forum. The Speedy Pro with 3861 only just came out at the start of this year and if you search this forum you can see that it's not an "old problem". I hear Omega is in the process of implementing a fix which is great. However, if I was in the market for a Speedy Pro 3861 I'd hold off for another year or two. Just my 2 cents.

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no 3861 yet for me either
maybe when the brushed finish under the lugs / case changed to polished as in the old days

Agree, but I was interested to receive a regulated FOIS back from Omega last week that is running at .6 spd (tested as such and has kept that rate since its return) suggesting that the 1861 is capable of better accuracy across several positions than I'd imagined. Whether it can maintain it longer term and across various conditions will be the question, I guess.

I was really looking forward to finally seeing the new Speedies, and wasn't disappointed. They're superb. But there are plenty of reasons to love the 1861-based models, including the proven movement and a substantial price differential. I'm not planning to "upgrade" anytime soon.