I am in the process of doing guides for all the secret league sevens teams, for the time being I'm trying to log here all of the roster changes for easier access. There may be some I have missed. In such and event please feel free to let me know and I'll get this updated.

• all reroll costs are doubled at team creation
  
• The leader skill is unavailable for selection. Note players that start with it such as Sartosan Pirate Captain keep the skill making them a premium recruit.
  
• Big guys are removed from all teams. Exception is Khemri variants who keep there one as if they were tomb guardians. This is pending further review after testing.
  
• Tilea teams may spend 300k on non-lineman players, this represents the half a budget they normally are allowed in normal secret league.
  
• Stunty teams keep their big guys, the exception at the moment are Albion who have lost Fenbeast access, pending review. Night Goblins do not have a troll either, they have enough strength and options to cover this "loss" without it underpowering them drastically.
  
• positionals that start greater than 0-4 are reduced to that amount, for example Witch Elves in their roster.
  
• Snotlings may take 0-3 trolls. Pending review.
  
• secret weapons need a roll to be sent off, this is to implement the hard coded goblin cheaper bribes effect. If this does not fire in the client, please let me know.
  
• Rasetra have a new lineman Skeleton Skinks they are 7227 and cost 40k. Sacrificing a point of movement and agility for thick skull and regeneration whilst maintaining dodge.
  
• Clan Eshin lose Clan Rat linemen. This is to encourage the fluffy approach and separate them from other Skaven clans. Pending review
  
• Elemental teams have apothecary access

This may not be a comprehensive list but I think it covers all, please let me know if you spot any missing.