Not a huge fan of either card unveiled today, although both are well designed.
I see Fool's Gold as mostly cumbersome, two of them gets you one past two Silver and you can't Mine them into gold. If you could trash for a Gold on other types of VP purchases, I'd be very intrigued, but cards that require two or three in your hand to really pull off, generally don't enthuse me much. I think once again the preview put two cards together that complement each other well, Nomad can be used to keep your deck full of Fool's Gold on the second buy.
Nomad seems fun as a buy in the first turn on a 4/3 split, as it bumps you to 5 on the second turn, which as we all know is really useful. Other than though, I don't see it as compelling, gaining it late in the game via a Feast or something might be useful when you are staring at 13+, and can draw it right into your hand. I see the card's utility as narrow, but when the circumstance is there, its a compelling card.