I've been in an RP for over a year now that has been rebooted 3 times since I've joined in. It's nice to change subtle things but stick to the main arcs. Like the fight with James and Deon, that would be an arc, but the whole lead-up to it could be different. (I suck at explaining things)

As far as forgetting what has and hasn't happened, we are by no means defined by what we've already done right? I for one wouldn't at all mind if the story took a completely different turn at a point, we are all very good roleplayers and therefore we should all know how to adjust accordingly, right? lol

Just don't stress, we'll be caught up in no time!