What is the Mother of All Bombs or MOAB killstreak reward?

I've seen a couple of online rumors about a killstreak or strike package reward when you get 25 consecutive kills that is similar to the tactical nuke from previous Modern Warfare games.

Allegedly it kills every player on the map.

Is this a confirmed part of the game or just rumor?

if it does exist - is it part of a specific strike package : i.e assault, support or specialist?

Any information on this would be great. Thanks!

It is a "secret" killstreak (25, excluding strike package kills, or 24 with Hardline) that's not bound to a specific strike package.

It is similar to the Tactical Nuke in Modern Warfare 2 — using it triggers a countdown, and a bomb drops. However, unlike the Nuke, it "only" kills the entire enemy team (as opposed to all players) and disables their equipment and killstreaks for a bit.

It does not end the match, though it awards double XP for the remainder of the match for the team that used it.