[asdff]

I think the existing understanding of evolution is still fine. Darwin wrote,

1.More individuals are produced each generation that can survive.

2. Phenotypic variation exists among individuals and the variation is heritable.

3. Those individuals with heritable traits better suited to the environment will survive.

4. When reproductive isolation occurs new species will form.

When Darwin proposed this, he didn't have any idea of molecular genetics, let alone epigenetics. Mendel too wrote about alleles but he didn't know about base pairs of DNA. Evolution really only concerns phenotypic variation, not the underlying basis for it, so it doesn't matter if the variation is due to a genetic or epigenetic change.