Since they're asking about art styles for a Cove older than he will be in Step 4, I figured it'd be a sequel, but it's true they haven't revealed much. I haven't gone through all their posts, but I haven't seen anything that specifies what OL2:N&F will be like.
Viewing post in Our Life: Beginnings & Always comments
Sorry for the confusion on that. Cove was only used in the art samples so the new love interests' designs weren't spoiled. Our Life: Now & Forever will have similar features to Beginnings & Always and the tone is the same, but the setting and characters are all brand new. I'm afraid the Step 4 wedding DLC with Cove is as far as his story will go. There won't be a time period past that. I'm happy you'd like to continue seeing more of him, though!