In relation to college prep for all, have you seen the video on the common core website - Learn About the Common Core in 3 Minutes? This does not look like the standards are being represented as "a floor, not a ceiling". Some may say this looks lock-step and one-size-fits-all. Here is a brief roundup of links:

Originally Posted by Unofficial transcript - Three-Minute Video Explaining the Common Core State Standards
Like it or not, life is full of measuring sticks, how smart we are, how fast we are, how well we can, you know, compete. But up until now it's been pretty hard to tell how well kids are competing in schools and how well they're going to do when they get out of school. We like to think that our education system does that, but when it comes to learning what they really need to be successful after graduation... is a girl in your neighborhood being taught as much as her friend over in the next one? Is a graduating senior in say St Louis has prepared to get a job as the graduate in Shanghai? Well, it turns out the answer to both of these questions is no, because for years states had been setting different standards for what students should know and be able to do at each grade level.

That's making it too hard to know if our kids are really doing well in the whole world and if they can really compete for a job someday. What we really need are clear goals. That's where the common core state standards come in. They're like a total sea change in education: consistent, strong, clear benchmarks for English language arts and math. Here's how it works. You can think of kindergarten through twelfth grade, like a giant staircase. Each step is a skill your child needs to learn before stepping up to the next one, but right now too many kids aren't really confident with like two plus two before they have to move on to two times two. We need more focus on the skills that help them move up the stairs or they can slip up and fall behind. And there's another problem. What if everyone's stairs will made a different height? Well here we go again. They are. So a boy in Seattle who's rocking an A in English literature could be getting a C on his Chicago friend's staircase. Oops.

We need to create consistent steps in education too. So first each standard creates a landing on the staircase. A stop along the way as your child heads toward high school graduation. Each stop is a chance for every parent and teacher to focus on the skills their students are supposed to know at that step, no matter the zip code, language or race. And more importantly, each standard makes sure all students are learning what they need to know to get to graduation and beyond because something like counting to 100 leads to understanding dollars and cents, which eventually leads to understanding how to manage your budget. Secondly, the standards are consistent from school to school and they match up against international standards, too. Now we know how we're doing compared to just about everyone, so even though local communities will still design their own curriculum... with the same rules, everybody can compete on the same kind of stair case. But standards aren't learning. That's why we need teachers, parents and students to help make that happen. By working together to help kids and meet these standards. The world is getting more and more competitive every day, but now when our kids get to the top of their staircase, they can have way more options of where their life goes from there. Clear goals, confident, well prepared students. That's the common core state standards.
NOTE: This vimeo video has been replaced with a different video on the Common Core website. However the original video may still be found by using the Way Back Machine (internet archive) and this Common Core link: http://www.corestandards.org/read-the-standards/ Once the archived page from March 14, 2014 loads, click on "video" in the upper right of the archived webpage. (Same video on youtube, here)

1. The video expresses dislike of steps of different heights (1:28-1:32). This seems to cap opportunities for gifted students, not allowing them to advance at a pace appropriate to each as an individual, based on readiness and ability.

2. By contrast we see a child being moved up, not under her own power, but by a giant hand representing the educational system (1:18-1:27)

In a video not related to the Common Core website, Sir Ken Robinson mentions the outdated industrialized model of processing students in batches by their chronological age or date of manufacture. See this at 6:4-7:45 in this youtube video Sir Ken Robinson - Changing Education Paradigms (length 11:40). This approach celebrates diversity by acknowledging and valuing individual differences among students.