I'd guess they're also waiting for the IRS to release the 2018 form.  Keep checking back here:

https://www.irs.gov/pub/irs-prior/f8917--2018.pdf

until it no longer says "If Congress extends the tuition and fees deduction
retroactively for 2018 (as Congress did for 2017 on February 9,
2018), we will post the 2018 revision of Form 8917 here."