From "Craft rewap" thread:
Old 15th March 2012, 11:18
#5 paulson
will there still be some craft in line with the current t3 craftsOriginally Posted by jauertussen View Post
first question when is it gonna happen
secound will all my tradeskill resources be anything worth, or will they be deleted, wud be pretty pissed if all the mats for t3 craft disapered including alot of shards.
and will thoes be good to keep for new crafts.
Crafting revamp have been deatached from the adventure zone, so it's probably coming in patch 3.5 instead of 4.0. The exact release date on crafting revamp in still unknown but probably not sooner than may-june.
3.3 is on test-live and 3.4 will probably need to be tested and tweaked for a month+ on live server too, and we're almost in April already!
We don't know what will happen to the resources, Silirrion have hinted that some resources may be used in the new system or converted.
Personally I have a hard time to see a crafting system without basic materials like leathers, silk, metals, and wood, and I think atleast those + rare materials like shards of exiled gods will be reused in the new system.
Gems however seems to be replaced with the effects system, and I doubt they will allow all the millions of gems to be converted into effects. Effects will probably be a new resource to prevent players from figuring out all the blends in 2 days.