According to the Block talent and timed effect code, three properties are available for shields: bloodruned, spellplated, and reflective. These add healing on block, spell save while blocking, and damage reflection on block, respectively.
This is not available in the current game because no shields have special_combat.spellplated, special_combat.reflective or special_combat.bloodruned, not even spellplated, reflective (or deflection?), or blood-etched shields.
(EDIT: 1000th post, wow, just 24 to go until a big round-number milestone)
[b40|svn] Shield Properties
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