To be honest, I'm not too big on CP either. As I didn't quite enjoyed the first series much. Oddly I found the third one more enjoyable. Though this one might be more interesting. The costumes looks kinda nice. And agreed, I'm not a big fan of Guli Nazha either. She always seem a bit emotionless on screen, and when she smile it seems a little force. And yes, I also prefer Gina Jin as well. I like her a lot actually. I've seen majority of her work, she's just a natural. For all it's worth, she is in here, so maybe we can enjoy her parts.
Story-wise, I don't know much either. But I share your worry where romance is concern. And for English Subs, I think it's almost a sure thing. Let's look forward to it together.