Well we know that the next update is covering Ian PoV from leaving the beach house to where Lena's PoV just ended.
We also know that Emma is possibly getting a wardrobe update, though I don't think we'll see it in Ian PoV until the next chapter. Emma was still wearing her regular clothes during Lena's PoV. So possibly in the next chapter we'll interact more with Emma in her new drip.
Other things we've speculated on, but don't have confirmation. Cindy should be back from her trip, so that story line can continue. Ian could potentially run into either Holly or Ivy or both on their way too or from the glory hole. Minerva has still not been given her gift if Ian bought one for her, so that seems likely. Cherry and Louise are still out of town, so there one be any scenes with them, but we might get some (s)texting. There almost certainly has to be a discussion between Ian and Perry regarding what happened at the beach house.
I would personally love another scene with Ian and Jess. Ian taking interest in Bad Jess and helping her has low key been one of my favorite storylines.