IOD
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It will be interesting to see how the IOD evolves with this event. For example, I noticed that the latest GFDL SPEAR forecasts showed a more positive IOD than last month's forecast, but it looked like the IOD was still forecast to be neutral. So, a positive IOD with La Nina would be unusual, but I don't think that outcome is certain.
As Emily noted, the IOD impact on North America wouldn't be expected to be strong, although there is some evidence that the unusually strong IOD in 2019 may have been a factor in the positive NAO in early winter. That also would have impacted North American climate. See, for example, this and this study.