Furthermore, the desktop/download versions of form 4562 were released today (1/31/18), but the online form 4562 won't be released until 2/8/18 by the IRS. Once released, TurboTax will implement it into the software.
See lRS website link below under "Forms Available for Filing Season 2018 (TY 2017)" to see release date.
https://www.irs.gov/e-file-providers/list-of-available-free-file-fillable-forms