So it looks like they have done it after all. In a move many hail as some kind of victory, DS and SPS have agreed to alienate both their supporters and form a government together. Word is that the prime minister will be the current finance minster Mirko Cvetković, a compromise figure in every respect. As a "nonparty" person, he is more or less acceptable to everyone. As a nonentity, everyone believes they can control him. He may surprise people on that second count.
The new government is set to have 28 ministries, affirming the place of Serbia near the top of the world demographically in ministers per capita.
The good news about the government is that neither Vojislav Koštunica nor Velimir Ilić will be part of it. The bad news is that SPS will be, and once again a party with minor support will excercise inordinate power. What is uncertain is whether SPS will use the opportunity to demonstrate that it has the capacity the become a political party, and also whether DS will use the opportunity to demonstrate that it has the capacity the become a political party.
PS: Backstory? -- Here are journalists speculating in Politika that Tadić was compelled to choose Cvetković by party leaders and that his preference would have been .... Vuk Jeremić????? But how little does one have to respect (even) Tadić to imagine anyone, even him, seeing Vuk Jeremić in any position where something might depend on him?