For 2025 US tax filing, form 8949 will have new crypto related boxes (G, H, I, etc.). Based on the text in the form, you will be required to file a separate 8949 for each box that applies to your situation. So, you if have some defi transactions and some cex transactions in 2025, you'll have to include at least 2 separate 8949 forms (most likely boxes H and I for 2025).

Can you confirm that koinly's TurboTax exports (or any tax software exports) for the 2025 tax year will make it possible for TurboTax to generate the multiple 8949 forms (each with the appropriate box checked and accompanying transactions documented)? If not, can this be a feature that's added?

Considering this is a new mandatory requirement by the IRS, Koinly's support for this should also be mandatory. Otherwise, Koinly users will be unable to properly file their tax returns and likely be flagged by the IRS. And since there isn't much info about this change in the Koinly docs, I imagine most Koinly users aren't aware of the change to the 8949 form