WWE creative reportedly has some difficulty in deciding how to debut some of the NXT Divas to the main roster and which names should be called up according to The Wrestling Observer Newsletter.
An idea pitched was the new Divas should come in and get rid of the old Divas and essentially "transplant" the NXT Women's division to the main roster or keep a few of the top Divas who appear on E!'s Total Divas. Stephanie McMahon was always planned to be involved and that was never debated but they did go back and forth on if she should bring them in and take credit as a babyface or not.
At some points in the discussions they were going to bring up four Divas - Sasha Banks, Charlotte, Becky Lynch and Bayley, but at other times they were just going to bring up two Divas - Charlotte and Banks or Charlotte and Becky.
It's said that both Triple H and Stephanie are supporting this angle so it probably won't be one of those WWE angles that is forgotten about within a few weeks.