Not sure :(
Below is a link showing the updated dates for all forms available via TurboTax. Originally TT stated that the 24th would be the day, looks like it got pushed back a day.
https://care-cdn.prodsupportsite.a.intuit.com/forms-availability/turbotax_fed_online_individual.html
Also remember they are in Arizona Time so if you are on the East Coast it will be 2-hours later for whenever they activate the form for official use
You can view the forms availability here.
Unfortunately it does get pushed back sometimes, as all dates are subject to change. Turbo Tax just wants to ensure the forms are fully ready prior to releasing them for e-filing.
TurboTax groups many changes in an update because installing updates on a Mac or Windows computer is time consuming to the user so TurboTax delays many changes so they can all be in one update.
When you only offer one product online it is easier to keep it up to date but desktop users do not want to download and install 200MB updates ever other day.