Seem a blog made a summary of what we'll be seeing in the 1.04 update.
I can't really translate all of it since I don't know what specific items or features are called in the English version. But I'll try my best.
You'll be matched regardless of level difference with Coop Password Matching.
With password matching, you'll be matched regardless of Oath.
QuickSilver bullets and Bloodpacks now can be stored up to 600, up from 99.
Various weapons, secretive moves will be tweaked. Mainly buffs.
It also says they fixed a bug with "銃槍", but don't know how to translate it.(Gun Spear?)
When defeating the boss of chalice dungeons, there will also be a chance for enhancement mats to drop.
Depending on the depth, the type of blood stone you'll be able to acquire will change.
For example. Depth 5 will have Blood Stone(Blood Rock?) as a rare drop.
There seems to be other tweaks which aren't specified here as well.
Sorry if there are any translation errors.
http://jin115.com/archives/52081586.html