Last minute tax law changes by Congress always cause delays.
The Bipartisan Budget Act of 2018 that was just passes on Feb 9th retroactively extended the tuition and fees deduction, PMI, energy credits and other deductions to Jan 1 or 2017. The IRS has no idea how long it will take to make all of those form changes. If the one 8606 has taken this long, that new law will change about 10 more forms.
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**