Yes, there have been some changes made to the deductibility of mortgage interest due to Tax Reform. In 2017, you could deduct interest on a mortgage with up to $1 million of mortgage debt. For 2018 that amount was reduced to $750,000 in mortgage debt, if the loan was used to buy or improve a first or second home.
For a full list of Tax Reform changes, see the following TurboTax FAQ.
https://ttlc.intuit.com/replies/6971774