The PIDB Blog had some info, that the agencies were basically a little slow in taking 25 years to submit all the records.
Maybe something will happen in April, but don't get your hopes up. The IRS tax and financial records will most likely never be released for a plethora of reasons. The Z generation is more interested in video games, and the newest phone app, rather than historical assassination records. There's a very interesting U-Tube vid on the film processing procedures involving the time line and chain of evidence.
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The rest of the records that can be released will be released on April 26th, 2018, barring any further presidential decisions that may push that date back. There are some categories of records in the collection that, in accordance with the JFK Assassination Records Collection Act of 1992, will not be released on that date. Sections 10 and 11 of the act discuss grand jury information and records held under section 6103 of the Internal Revenue Code (tax return information) as well as records covered by a specific deed of gift. The complete text of the Act can be found in Appendix C of the Assassination Records Review Board's (ARRB) Final Report. https://www.archives.gov/files/research/jfk/review-board/report/appendix-c.pdf