There's a Legendary TOS Federation Captain's Bundle for sale in the Zen Store starting on September 8, coinciding with the re-running of the Temporal Recruit event. Read about it HERE.
Details on the aforementioned Temporal Recruit Event are listed HERE. It runs from September 8 to October 7.
From September 2nd to September 6, there's a Bonus Marks Weekend going on, that announcement is HERE.
PC Patch Notes for 8/31 are HERE.