Required? Technically, no. Of course, you now have to provide the CHARM booklet and ARM program disclosure, which are separate from the TRID requirements.
As for issuing a revised LE, there are those who will say "absolutely not," because it's not required and they don't issue "informational" LEs, because they can confuse borrowers more than inform them and because they would have to check eachy of the costs for good-faith and adjust them for any changes before issuing the revised LE.
There are also those who would send a revised LE because so much of significance will change with the change from fixed-rate to ARM. You'd find me in that camp.
John S. Burnett
Professional Compliance Nerd since 1976
Bankers' Threads User #8