Bungie has released the fixes and updates to be included for the June update on Halo 3.  Here’s the complete list:

Hardcore

ADDED Head to Head (Ranked)

• 1vs 1 hopper
• Relies primarily on Duels-style Slayer (indicator over the head of the person with the high score)
• Smaller maps customized in Forge
• Low weighted instances of Oddball and KotH

UPDATED MLG

• v5 map variants added
• Forge map “Amplified” added for Slayer and KotH
• Blackout replaces Guardian as Oddball map
• Legendary not required on this playlist.

UPDATED SWAT

• ShWATguns variant added
• Shotty starts
• No shields, 150% damage resistance
• SWATball variant added
• SWAT style oddball
• 200 points to win
• SWAT 2 Flag variant added
• SWAT style Capture the Flag
• On The Pit and Snowbound
• Players can not return flags, returns after 15 seconds on its own.
• 3 Flags to win

Ranked

UPDATED Team Slayer

• Decreased weighting on BR start game types

UPDATED Team Objective

• Increased weighting on symmetrical map/gametype combinations, Example: Multi Flag on The Pit
• Increased weighting on asymmetrical map/gametype combinations, Example: 1 Flag on High Ground

UPDATED Ranked Big Team

• Ranked Big Team will be worth double EXP for the month of June
• All restrictions are being removed.
• Fixed bug from May Mid-Month update that made the playlist require Legendary (The June playlist will only require Heroic)
• If Ranked Big Team does not perform well this month, it may be retired in July.

Social

UPDATED Social Slayer

• Team Snipers “Score to Win” requirement increased to 50

DLC

UPDATED DLC Slayer

• Reintegrated Heroic Maps

UPDATED DLC Objective

• Increased focus on asymmetrical games on Avalanche, symmetrical games on Ghost Town
• Reintegrated Heroic maps

Double EXP Weekends (In order of appearance)

ADDED Rockets

• 8 Player FFA Insanity

UPDATED Grifball Spring League

• Bug fixes from the May version so that Carrier Damage Resistance is correct
• Bug fix so forced player color is correct when carrying the bomb.

UPDATED Team Snipers

• Score to Win requirements increased to 50 for slayer games

ADDED 3 Ball

• 4v4v4v4 Gametypes with 3 Oddballs