A brave poster risked the flames of the official forums to ask if tier 3 items would scale in order to be useful at level 70. Blizzard poster Drysc was quick to answer:
Fundamentally speaking allowing items to scale up with level would undermine the worth of new items. The goal and achievement of character progression through itemization would be reduced if you were able to simply wear your Tier 3 items forever. We intend for old items to be sloughed off, and item upgrades and achievements to be the new hotness. Moving forward being the goal, character progression and not stagnation. In almost all cases items scale down with level increases, either in effectiveness or purpose.
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