The Government (USCIS) will likely appeal to the 9th Circuit court to get the fee increases pushed through. However, no one knows when the appeal will happen or what the result of the appeal will be.
What does this mean for you?
No one knows if or when the new fees will be made effective, but as long as the injunction is in place the USCIS cannot raise fees. Taking into consideration that fees could go up for many applications at any time, it's generally a good idea to prepare & file your Green Card or Citizenship applications sooner rather than later.
See the chart below to see the differences in the current vs new fees.
Current vs New Fee Increases