The upcoming trainer is for the gold edition of the game. CH is taking this DLC as a separate game and as such, it will have a different trainer than the vanilla RE5 trainer.
Or at least that's how it looks so far. Thing is, when I tried to use the vanilla RE5 trainer it didn't work on my game, since I updated mine with the DLC. So don't know whether ultimately we will be getting two trainers for RE5 and RE5 gold editions or CH will simple remove the RE5 (vanilla) trainer section from library altogether.
its NOT LIKELY that we will be updating the normal RE5 trainer from 100 years ago. we basically updated the trainer for the new GOLD version.