Sony probably won't have a major presence at either Gamescom or PGW because i don't think they have anything big to announce at this point. PSX will probably be used to give updates on Last of US, Ghost of Tsushima and Medieval, and to announce some smaller titles.
yes I don't expect anything huge. maybe 1 surprise but thats about it. unlikely tho
am expecting smaller titles from 3rd parties and probably that bluepoint game