The IRS releases new revenue procedures at the beginning of the year that address how to proceed with all sorts of things you may need from the IRS. Those changes can include changes to user fees/filing fees, and this year it does.
The fee for filing a 1023 or 1024 went down to $600. The filing fee for the 1023-EZ is still $275. The filing fee applicable to organizations seeking a group ruling went down to $2,000.