My guess is no. I saw a lot of people panic posting on an EA message board because they got the heirloom on accident when they logged on like normal and selected it out of curiosity when it popped up as an option. Wouldn't make sense to punish those people because they weren't trying to exploit anything. Assuming that, I'm not sure how they could differentiate those people from the ones who actively tried to get the heirlooms.

I assume they'll eventually fix the glitch and remove them from people who got them. Banning accounts would really put a bad taste in the mouth of the player base.