<p>The following is from Yale's website:
New SAT Subject Test Requirement
For the coming admissions cycle, Yale will require only two SAT II Subject Tests in addition to the SAT I. Please note that this is a change from the previously required three Subject Tests. If you have chosen to take the ACT with the optional writing section, you are not required to submit any SAT scores. <a href="http://www.yale.edu/admit/news/sat.html%5B/url%5D">http://www.yale.edu/admit/news/sat.html</a></p>
<p>This suggests that Yale is considering the writing section maybe like SAT II, since it requires only two SAT II tests.</p>