In British English „All the trimmings“ means:„all the extra things that traditionally come with something to make it more special“
As you can see here:
So regarding the statement made by CA it probably just means that the Free LL will come with all the extras that make LLs more special. So things like unique animations, magical items, interesting mechanics, quest battles and so on.
Even if it’s intended to be a pun about „trimming wood“ it could just be a pun about umm... Wood Elves.
So that doesn’t mean the Free LL cannot be Drycha, she is definitely a very likely choice. It just means that she is not 100% confirmed.