New content: Create Big Cannons, Shield Generators, and Animus added in 1.6.0; Mystical Automation, Linear Bearings, and Mystian Apiary added in 1.6.1. Twemoji was swapped out for Emojiful in 1.4.0.
Major reworks: Structure Placers replaced Redprint (1.3.0); the Advanced Coke Oven got a new multiblock structure (1.3.0); Platinum processing was reworked to align with Modern Industrialization's Oritech tree (1.6.0).
Notable fixes: a duplication exploit via ship-assembly (sifters, item drains/vaults/sluices duplicating contents) fixed in 1.5.1; a disconnect-on-world-load crash and airship physics crash-tracking fixed in 1.6.1; two day-one hotfixes shipped (1.4.1 for a missing server dependency, 1.5.1 for an AppliedFlux crash).
Dozens of smaller duplicate-recipe and quest-text fixes throughout, omitted here as routine.

Changelogs
1.7.2 - https://feed-the-beast.com/modpacks/134/changelog/100473
1.7.1 - https://feed-the-beast.com/modpacks/134/changelog/100472
1.7.0 - https://feed-the-beast.com/modpacks/134/changelog/100471
1.6.1 - https://feed-the-beast.com/modpacks/134/changelog/100466
1.6.0 - https://feed-the-beast.com/modpacks/134/changelog/100458
1.5.1 - https://feed-the-beast.com/modpacks/134/changelog/100455
1.5.0 - https://feed-the-beast.com/modpacks/134/changelog/100453