New news means new post.
http://us.battle.net/d3/en/blog/19802338/patch-230-ptr-preview-6-23-2015
Highlights -
Horardric Cube II to be in, which will allow Legendary item affixes to be ripped from their items and equippable in some fashion, as well as crafting material transmutation.
Furthermore regarding crafting, there won't be standard sub-70 materials, but there will be new Act-specific materials to be obtained from the Horardic Caches. We hope you've enjoyed your vacation from hunting for Reaper's Wraps materials and the like, and that you have ample inventory space to contain them all.
Difficulty Creep has been allowed, resulting in Torments 7 - 10 to now exist.
Also, general vagueness about new Legendary items and adjustments to monster XP values and status ailment tolerance (i.e. the same thing we do every patch).
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I guess the main thing to do in preparation is to hang onto Legendaries which are currently interesting but useless, on the chance that they can become useful through the new Cube.