As of today, cynosural field generators can be attached to fewer ships than before in order to make dropping into a fight a tactical choice instead of the standard rules of engagement. Industrial ships, blockade runners, and deep space frigates that relied on these fields to safely traverse the more dangerous parts of space will still get to do so with the introduction of a new industrial cyno field generator, which should make space trucking slightly less awful as a result of these changes.
Your eyeballs will also get to enjoy some new visual treats with updated wormhole graphics to better see how much of a lifespan a wormhole has, overall visual improvements, and updates to the UI/UX. The September patch also made changes to the Venture in order to prevent it from capturing lowsec faction warfare complexes. All of the salient details are in the patch notes.
In related EVE news, the game will be making the 64-bit client the norm this coming Wednesday, September 11th, as the sandbox continues to future-proof itself. The 32-bit client will eventually phase out, but the option is still there for now for those who need it.