According to Donga Ilbo on January 13, a representative revealed that Taeyeon will be releasing a digital single in the middle of February. The song is said to be completely composed, and the MV will be filmed in the middle of this month.
But SM Entertainment responded by saying, "Taeyeon is continuously working on music. About her comeback report, nothing in detail has been decided yet."
The same news outlet said that Tiffany is also preparing a solo release, and other members are too. SM Entertainment had previously responded to those rumors by saying Tiffany's solo debut was not confirmed.
It'd be pretty awesome if both of them had solo releases this year, along with the other members!