Seems like the art for the new set coming out, Kaladesh, is coming out strong out of the gate. Also, looks like artists got to each do more pieces than usual,
Chris Rahn already auctioned off two pieces on eBay (both ended $3,250 I believe); has another one in auction right now(already at $5,800 with 4 days to go and even though I find it to be the weakest of the bunch); one offered for a fixed price on FB; and may have another one for auction shortly.
Volkan Baga has at least 5 pieces his rep is/will auction on FB .
Matt Stewart has one piece on eBay right now (at $4,200 with 4 days to go).