It's all a bit unclear about what the plans are. I've heard them saying a few times that the show is playing "now through July" - so July 6th might not only be Nicole's last night, but also their closing night. But I suppose it depends on whether they decide to extend and try to find a replacement or not, or if the show gets a lot of nominations for awards and that starts to drive audiences/ticket prices up again, perhaps they might do a short-extension (to make sure the show recoups its investment). I would think it's still too early to purchase tickets and in terms of refunds I don't think seat geek is flexible in terms of that. You would be able to "resell" them through their website, but I don't think you could get a full refund yourself.