A. The classic modules will be completely rewritten to fit mechanically, and canonically, with the current 4th edition. The downside to this is it will take extra time before it would be to you and your gaming table.
B. We take the classic modules and faithfully reproduce them (including the spelling errors, page misalignments, and anachronisms), but players are given an addendum that provides relevant stats to fit in with 4th edition. This would get them onto the gaming tables much sooner. The downside to this is that it would require more work on the part of the game masters who wish to use the module.
C. Leave the old modules alone.