Shield Specialization. The tool tip was just changed in the last Beta patch 8885. I removed all my tBC Block Value gear pieces and the Shield. Only Block Value on gear is from whats provided by Strength Stats.
Spec down to Shield Specialization and clearly shows it currently still does not increase BV from Strength. It only increase BV from Shield Block Value stats. I'm sure allot of others already reported this to be fixed, but I reported it as well in the suggestion feedback, hopefully it does get fixed.