39 crossbow weapon items
The Forever catalog holds 39 crossbow weapon items, topping out at item level 89 with Nerubian Slavemaker, Nerubian Slavemaker, Grand Marshal's Repeater. Every weapon in the Forever catalog, from the vanilla dungeon and raid drops to the new Forever additions, sorted by item level with daggers, swords, staves, polearms, bows, guns, and wands as filters.
Source: the World of Warcraft: Forever beta client's item tables and Blizzard's Game Data API. Updated with each beta build.