Information by Piotr Kazmirek: 1, 2 and 5 groszy are not new types, they are the same as in 2014 (The Royal Mint series). The difference is that they are now minted at Mennica Państwowa in Poland. All specifications remain the same, including composition, they're made of brass coated steel. Mint marks on new coins are in different position however, on the left side of eagle's tail, not on the right like before.
(news by Taneli Perätalo, Jacek Stacel and Pabitra Saha)
LINK: Central Bank of Poland