Q. Will the Rise of the Necromancer pack be available for play at midnight? A. No. The Rise of the Necromancer pack requires Patch 2.6.0 to be installed; after maintenance has completed in your region, you’ll be able to purchase and access the Rise of the Necromancer pack.
Q: When will maintenance begin? A: PC NA/SA/ANZ: 10:00 a.m. PDT EU: 11:00 p.m. CEST KR/TW: (June 29) 2:00 a.m. KST CN: (June 29) 5:00 a.m. CST
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The best Items and maps going to be implemented into the game.
Steps:
1.It will be tested in a new mini beta server.
2.Next it going to move into PTR.
3.Going live.
Mini beta server would be design to contain "small" group of testers, which gonna play it for a 1 month.
Yes, blizzard have to spend more resources on that "new mini beta server".
The cycle of designing-testing-implementing will be just on time, before the new season arrive.