Shield Block RIP

Still thinking about avoidance - so if block is 30% mitigation, what will happen with shield block? Presumably this will go or change substantially - otherwise 100% block/avoid chance, and hits that get through are mitigated by 60% (90% if it's a crit block)!

And this active 25% of the time?

I think that shield block will be changed signficantly in Cataclysm.

This is a shame, as it's one of my favourite warrior abilities.