Originally Posted by Baern

There appears to be AP scaling on the threat of a number of warrior abilities in WotLK (Sunder, Conc. Blow , Shockwave, I would assume others) as well as on some of the DKs Frost spells.
Seeing as DKs will have no use for Block Value, changing the formula and replacing all Block Value with Strength, at least on non-set plate would seem like a sensible solution.

In fact, seeing as Block rating is only really useful for Paladins in gaining uncrushability, if crushing blows are removed then I wonder if we might see block rating and value disappearing from non-set tanking items. I wouldn't be suprised if the Prot pally tree ends up with some AP to Spell damage converstion, meaning you effectively end up with 2 types of non-set plate, tanking plate which has strength to allow threat scaling for all 3 plate tanks, with no points spent on block, and then dps plate to share between the dps specs (the Blood tree appears to be similar to ret in that spell damage offers little benefit, and Unholy has an AP to spell damage conversion talent).
This would leave gems, set items and the odd misc. item to talior it more specifically to a roll.