I'm specifically interested in the limit on employee elective deferrals on traditional 401k plans. This does not include employer contributions or catch up contributions for those 50 and over.

The 401k individual limit for 2024 was announced on Nov 1 2023 to be $23,000: https://www.irs.gov/newsroom/401k-limit-increases-to-23000-for-2024-ira-limit-rises-to-7000

What will it be for 2025?

I will use the official IRS site as source.