Except as provided in this section, the provisions of §§ 20.2056A-1 through 20.2056A-12 are applicable with respect to estates of decedents dying after August 22, 1995. The rule in the fourth sentence of § 20.2056A-5(c)(2) regarding unitrusts and distributions of income to the surviving spouse in conformance with applicable local law is applicable to trusts for taxable years ending after January 2, 2004.