This appears to be all that is out there at the moment:

Forms for the 2019 NJ mid-year Corporate and S-Corporate filings have not yet been made available by the state of New Jersey. 

The 2019 CBT-100, CBT-100U, BFC-1, and CBT-100S returns are currently in the process of being finalized. Therefore, taxpayers filing a CBT-100, CBT-100U, BFC-1, or CBT-100S, with an original due date of November 15, 2019, or December 15, 2019, (i.e., fiscal tax year filers which had a tax year ending July 31, 2019, and August 31, 2019, respectively) have been granted an automatic extension to file their tax returns by January 15, 2020. 

Taxpayers filing under this automatic extension will not be charged late filing penalties if the returns are filed by the extended due date. The extension applies only to the filing of the return and does not extend the time to make all required payments.