Nobody knows, but I think thats a fair guess. There are a lot of things I think are possible.
option 1: pvp is 10-19, 20-29, etc like we've come to expect wow pvp to operate
option 2: pvp is 10-14, 15-19, etc owning to the vast power differences between levels. This would also see bracket populations more or less unchanged
option 3: pvp is fully scaled like the Korraks AV event and brackets are 10-50 or even 10-60
option 4: (and the one I think is most likely) pvp is 10-14, 15-19 etc for regular BGs and korraks style scaling for epic BGs.