Common Core Standards

Every year it seems like curriculum is changing and now with the adaptation of the Common Core Standards it will be changing again.  We just received different genre units for English this year and now looking at how we are supposed to be implementing in the Common Core standards for next year, units will need to be changed again.  The idea behind the whole Common Core I think it good so that our students are just as prepared as others across the globe, but how will we test them and what will be the cut-off for passing?  If we are completely doing away with MEAP tests and the MME in 2014 and replacing with this new test completely computer based, how will our students do?  Right now with MEAP is they receive 50% or better they pass, but with the Common Core everyone involved gets to set the criteria...what if it is too high and our students can't perform to that level...then what?