Four additional teasers for “I” have recently been released through Taeyeon’s website. One new photo is shown above and the remaining are posted below. Video teasers for the “I” music video will also be released later this afternoon through Taeyeon’s Instagram and the everyshot phone application

Taeyeon’s first mini-album is now available for pre-order through online retailers, including YesAsia (poster in tube, no poster), KTOWN4U (poster, no poster), KPOPTOWN, and Gmarket.
Original article from October 1st, 2015:
Taeyeon’s official website, opened yesterday for her upcoming solo mini-album release, has just revealed four additional teaser photos for “I”. Yesterday’s teaser photos can be seen here.