I think that the fact 3 members of the SG1 are yet to referee a PL game yet, trial games are unlikely.
In terms offered SG2, I wouldn’t be surprised if Craig Hicks gets another chance. Also, David Rock seems to have been getting decent appointments last season and this so could be one to watch. And I think Bobby Madley is always likely to be in the discussion when it comes to SG2 promotions. When might they happen? I reckon closer to Easter time!