Updates:
March 12: now that we know that there are no Fetchlands in Dragons of Tarkir the probability that any of them could be in Modern Masters 2015 is not zero, however small it could be.
May 2: Splinter Twin is in. Prices have gone down a lot for some of the Modern staples on the expectation or certainty that they will be in MM15.
May 5: Primeval Titan, Eye of Ugn (a land) Cryptic Command are in.
May 6: Hurkyl's Recall, Vendilion Clique, Fulminator Mage, and Leyline of Sanctity are in
May 7: Elesh Norn, Garnd Cenobite and Dark Confidant are in.
Link to the next installment