Flying BKK-HKG then two days later HKG-LGW. In PEY (E class). Until recently both flights have been showing PEY full bar one seat in MMB. Now MMB not displaying the seat map - does this mean the cabin is full?

What are the chances of an upgrade to J class, I'm Oneworld Emerald and the Mrs Oneworld Sapphire. Also do CX offer upgrades for cash at OLCI?