As part of our Navigation revamp we moved away from the tabed design of the Plan test cycle page and have further subdivided the Plan Test cycle page into Cycle Summary, Search Test Executions, Manage Executions filters. These are available under the "PLANNING & EXECUTION" section of the Zephyr menu.
All functionality of Zephyr itself is neatly integrated into the Zephyr sub menu on the left panel, as opposed to staying on directly on the left panel. This has been modified both at the global and at the project level to keep teh navigation experience consistent.
Hope this answers your question about the Planning Test cycle menu.