Wouldn't be surprised for more info on H-20 which was hinted early on this year.I expect J-20 to make an appearance flying again, but I would be surprised if they have it in the static display. If it does indeed land at the show, it will likely be off to the side. Will be looking out for signs of development on UCAVs, any updates to FC-31, and status of JF-17 - which had a lower profile two years ago. Also, will there be a model of an aircraft carrier equipped with E-MALs? Probably not, but it would certainly be cool. Unfortunately, AVIC/CATIC not terribly friendly these days. Used to be a simple matter of chatting them up at the stand, but not anymore.
The PLAAF would never release a model of a highly secretive project under any circumstances, let alone a highly publicized event like Zhuhai. At most, we can hopefully expect another H-XX teaser like the one we saw in May ...We can certainly hope for that. A model would get a lot of attention!
Very, very unlikely. They might instead display some stealth UAV/UCAV models and maybe some info on hypersonic developments.