Dark Souls 3 will be receiving patch 1.04 which will offer a variety of changes and improvements along with changing the way certain weapons work. The patch notes indicate a “performance adjustment” for Greatswords along with a battle performance adjustment for Dancer’s Enchanted Sword and Winged Knight Twinaxes, performance adjustments for the Soul’s Greatsword and Farron Flashsword. No specific changes were outlined so it’s hard to say whether the weapons were “nerfed”.
The patch deploy on April 18th for PS4 at 7 PM PST/10 PM EST and for Xbox One at 5 to 8 PM PST/8 to 11 PM EST. The PC version has the patch listed as 1.03.1 and releases at 2 AM PST/5 AM EST on April 18th (it should be available now in fact).
Source: Rheena.com