The programs I'm aware of are all going to stay pretty DO-centric. Another observation is that you definitely don't necessarily need a 250/700 to be competitive, although it can help, because they are huge into the fit of the applicants. These programs are smaller they are like little residency families and one bad egg can cause problems for a number of years. This means they will often give looks at people with scores that are slightly less than stellar in search of the perfect fit. Now of course some programs are very number's heavy, and by "slightly less than stellar" I don't mean 400s-low 500s, but you can be in the running with a high end 500s-650s score if the rest of your app is in line.
Research is also becoming a much bigger factor to a lot of programs because of the merger.
There is also a luck component as well unfortunately.