Yes, DB has confirmed the 4 LI's, Charlotte, Emma, Lucy, and Suzi, on his Discord and here.
Kaylah and the new brunette in the preview are side girls or "distractions" for fun. Although I think having fun with them will have serious consequences for your chosen LI path.
I agree, in the past, the Emma and Suzi paths were hard to see a way forward. But with the last update, I think Suzi will see the MC in a new light. Imagine if Hannah tells Suzi about how the MC handled Johno.
Also, with Zak now actively pursuing Emma/Charlotte and the forthcoming train wreck that is bound to happen, and the revelations about MC's past with the model Emma, I see things quickly changing on how the MC is perceived by all the Lloyd family. We'll have to see how skillfully DB writes the story.
As an example, just two updates ago, Charlotte would even touch the MC. Now, she's a lot more comfortable, talking with him, and empathizing with him as she discovers more about. She even shown signs of jealousy when Kaylah' s around.
I really look forward to the next update.