I think initially we will only see "new" stuff. Now a lot of people never discovered Necromancer, so if this partnership gets a lot of new fans maybe then it will become worthwhile to re-visit old product.
The only revisists I really would like to see is for Amulet/Crucible and Tomb of Abysthor (with some expansion fleshing out, similiar to RA:R) and all of the Tomes being re-done in full color glory.
Other than that, a lot of the "1st Edition Feel" and old school feel is B/W art, so I am not sure how much going full color would change that appeal for me. The biggest thing is wicked and deadly adventures to cool and somewhat exotic places. So as long as they keep that up I believe I will stay happy.
As for futture new products I would like to see, I'll continue to trust Bill and Clarks decisions on that issue. They've managed to keep me happy for about 7 years, so I am not about to lose faith now.