Does prestige reset weapon prestige

It appears that if you buy the Season pass (available on steam), it comes with "The Giant" zombie map. From the link:

 About This Content
 The Call of Duty®: Black Ops III Season Pass delivers 4 epic DLC map packs
 in 2016 with all-new multiplayer content, including re-imagined 
 fan-favorite maps from Call of Duty®: World at War and the Call of Duty®: 
 Black Ops series, plus thrilling Treyarch Zombies content, all for one 
 great price.*

 Fans that order the Season Pass will be among the first to experience
 the return of Zombies with “The Giant” Map in all of its undead glory
 on Day One. Set in a World War II-era research facility featuring the
 weapon-upgrading Pack-a-Punch Machine, re-live the chaos of Treyarch's
 classic "Der Riese" Zombies map, picking up the Zombies story with
 Dempsey, Nikolai, Richtofen, and Takeo where Origins left off.

Purchasing the Deluxe edition also gives it to you (since it comes with the season pass).

In addition to being the first step of a dark ops calling card, you need to complete all five Rituals to enable the Pack-a-Punch (Which allows you to Pack [upgrade, 5000 points] and then RePack [essentially enchant, 2500 points per "roll"] most weapons in the game). Even if you're not after the map's side quest, you will want to at least get the rituals done so that you can pack your weapons.

You do also get a small point reward (I think it's 500 points) for being in a ritual zone when the ritual is complete. This is per player, so in a four player game, if everyone is in the ritual zone, each player gets that bonus individually.