From what was discussed in their most recent Dev Update:
- Rank splits will be moving to 3 splits per season.
- Preseason PBE will be releasing around mid-November instead of October and preseason will release official in January.
- Mythic Items system will be removed (fucking thank you).
- Arena game mode will be coming back around December.
- Nexus Blitz is coming back in late-October.
- Riot will be testing out the AI for their bots for improments.
- Skarner's rework is still on track for next next year.
- Jax's visual and audio rework will be revealed sometime around mid to late September.
Overall thoughts from me, I am so fucking happy the Mythic Item system is getting scrapped since it hindered the build creativity that the game had. Nexus Blitz coming back is such a win too, love that game-mode and I hope to see Arena back and improved too. Do share your thoughts here guys.