The USCIS has released the new forms that seek information to comply with the new public charge rule. Refer to Part 6 of the I-129 form here. The new forms must be used for all filings as of Oct 15, 2019. It’s amazing how quickly the USCIS delivered with the threat of another Federal Judge chiding them and telling them to “get your act together” !
Update as of 10-11-2019, multiple Federal Courts have blocked the implementation of the Public Charge rule and the enw forms.