I don't know anything about Bright Futures, but our daughter graduated in 2000 from an International Baccalaureate program at a Virginia high school. It was a rigorous four-year program and could substitute for the first two years of college if students did well on their final IB exams. I think it is pretty much the same today except the program is now split into two two-year segments: 9th-10th grade and 11th-12th grade.
In her school district, any eighth-grader could apply for the program, but admission wasn't automatic. It was based on middle-school grades and the results of an IB admissions exam. At the time, there was only one IB magnet school in the district, and all IB students started there as a cohort in 9th grade and stayed together for all four years. They had little academic contact with other students at the same school except for classes like PE, band, chorus, drivers ed, etc. They could fully participate in all the school's extracurricular activities (sports, journalism, clubs, etc.)
Her IB program really was a package deal, although students had some choices (e.g., foreign languages). The curriculum was tied together by three additional special features that added a lot to kids' workloads (a year-long philosophy course called Theory of Knowledge that she hated, a two-year independent-study original research thesis that she loved, and a two-year self-designed community service program which she enjoyed but was a pain to fit into her after school and weekend time. That said, she still had time for dating and a lot of outside-of-school fun; she hung out all the time with two other girls and two boys from her cohort.
About half of the students in our daughter's cohort dropped out of the program, most before the end of the second year. It was just too intensive, difficult, or time-consuming for them at that point in their lives. Most of our daughter's friends who left went back to their regular high schools, took AP classes, and did just fine.
Those that finished the program received a Virginia Advanced Studies Diploma with Governor's Seal, an International Baccalaureate Diploma (from Switzerland if I remember correctly), and a whole bunch of college credit depending on their final IB examination scores. They also pretty much had their pick of whatever college they wanted to attend. Our daughter chose William and Mary, but she had good friends that went to Dartmouth, Berkeley, Notre Dame, Duke, West Point, and Annapolis.
Here's a link to the program at her old high school; it looks to have remained pretty much the same as it was twenty years ago:
https://princessannehs.vbschools.com/students/IB_MYP/IB_diploma
And here's a link to the worldwide IB Diploma Programme website:
https://www.ibo.org/programmes/diploma-programme/
Hope this helps with your daughter's decision.