They said everything will be wiped expect your Rank (exp). They also said that if they increase the amount of exp it takes to get to a specific rank Ie you've farmed a grand total of 100,000 exp over your career but now you need 200,000 exp to be at the rank you were you will not be granted the rank just the exp. So, if rank 10 required 100,000 exp in total and now needs 200,000 in total to get to rank 10 you might be rank 8 or w/e after the wipe. At least that's how I read it.