Taking to the forums to announce the patch's completion on Wednesday, Stardew Valley dev Eric Barone also stated how he wouldn't release the patch into the wild before he was certain every major bug was either squashed or accounted for.
Now, just 2 days later, the patch has been penciled in to launch this Monday.
Though detailed patch notes are available on the main forum post - along with congratulatory messages from the players - the main changes heading into the game at the start of next week are likely the following.
There's also the possibilty of divorcing partners and constructing teleport totems to bridge the gap between long distances like the mountain and beach areas. Two new buildings - a Shed and Mill - can also be placed to either create additional produce overnight or simply act as a place to decorate with junk.
Again, the official patch notes contain a lot more than what's been listed here. Head on over to take a look at those and likely hear about other player's suggestions for the game going forward.