Interesting article. Sounds like if you match into a specialty tracked program where the osteopathic internship has historically counted as the PGY-1 year, not much will change. Looks to be less "rotating" and more specialty-focused which probably won't break too many hearts.
The 2nd option looks to be about the same for people entering into Radiology, Neuro, etc. Again, with more of a focus on your specialty and less rotating.
The 3rd option appears to be exactly the same. If you don't know what you want to do or want to train at an ACGME program, you must do a rotating internship to keep the AOA people happy. I can see that logic for individuals who are undecided and need/want to be exposed to Peds, OB, IM, etc. again. Unfortunately, the AOA doesn't appear ready to allow people to do MD residencies without some sort of hitch.