Birth indexes have been updated to include all entries over 100 years old, so they now cover 1864 to 1914 (mother's maiden names are included from 1900. Death indexes have been updated to include all entries from 1864 to 1964. In both cases, only the end year has been extended.
It's the update to the Marriage indexes which is the most significant. While the Marriage Index runs from 1845/1864 to 1939, 'Enhanced' records ie those that show both parties to a marriage, now start from 1882 (about 20 years earlier than was previously available). This development will be well-received by Irish family historians.