I was thinking that the changes in the test could work in their favor because the test-prep machinery for the new version will take some time getting up to maximal performance.
That is my hope also. DD14 is not at all into test prepping, but usually does quite well and has pretty much no test anxiety. I figure her relative score will be better against un/under-prepped kids than it would be most other years.
Last week her post-test mood was pretty much the same as always - when I ask how it went, I get a blase "Eh, it was OK."
Best of luck,
--S.F.