On the other side, I've retained Covington in the past, and found their work product to be excellent. Unfortunately, (nothing negative about the firm or lawyers mind you) between filings, motions, appeals, and oral arguments, they could run up a six figure bill in no time fighting a parking ticket.
An earlier poster mentioned something about them taking the case on contingency, but that could not be the case here. The relief being sought is essentially dump the Deeming Rule and grant an injunction to prevent the FDA from enforcing it. There are no monetary damages, and the best Nicopure could get would be reimbursement of reasonable legal fees. The question for Nicopure will end up being how much are they willing to spend before the expense outweighs any profit or projected future profits.
I also doubt Nicopure will be the only company bringing suits on this. Others might use different arguments which could be successful if this fails, or perhaps there will be some sort of consolidation so you don't end up with potentially conflicting rulings, and have it all heard by the same judge. Clearly, there will be a lot of litigation over this, and it will be years before it's settled.