With the announcement that support for D6 is ending soon, I have to seriously plan for a migration now. I've avoided upgrading to D7 but will not go straight to D8. I'd like to get some general guidance before I go too far.
(1) I run a custom theme on my D6 site. Will this migrate to D8 or will I need to redesign it for D8?
(2) I make some use of Chaos tool suite, Drupal Wiki, Forum and Advanced Forum modules. Are these all migratible to D8?