Some particular things I’d like to see in Eps. VIII & IX:

Ren to suffer a full psychotic break and go full-on schizo, causing him to hear and see things which aren’t there, talk to people others cannot see, etc. Really make him a dangerous, unpredictable villain who is potentially as much a threat to his allies as he is to his enemies.
A morally gray Resistance which isn’t apprehensive about torturing enemy captives, performing terrorist attacks on enemy-loyalist planets, etc.
Snoke’s “oral cancer patient” appearance to be revealed as a holographic facade, hiding a true form which isn’t sterotypically evil.
Some very surreal Lynchian imagery.
Rey with her own distinctive lightsaber at some point (preferably one which isn’t blue or green or even yellow or purple).
No more callbacks to the OT.
Knights of Ren with non-red lightsabers.
Rey to be revealed as Luke’s daughter.
A romance between Rey & Finn.
Mara Jade’s introduction.
Luke not to die.