The 0.75 beta features:
-Two new playable clans: The Kuroda and the Go-Bugyo (The Go-Bugyo campaign is freeplay; same scenario, no time limits of expectations).
-Further implementation of the 'Sekigahara' scenario
-Historical daimyo models for Toyotomi Hideyoshi and Kato Kiyomasa as well as new daimyo models for Kuroda Nagamasa, Kato Yoshiaki, Otani Yoshitsugu, Ikeda Terumasa, Hosokawa Tadaoki and Kobayakawa Hideaki.
-'
airinin' (agents) make their debut.
-16 unique unit concepts on top of dozens of standard units and unit variants.
-Extensive polishing and bug-fixing (one major point being daimyo names).
...and much, much more that would take a fair bit of time to properly document.
V0.6 Updates:
-Crippled Katana Ashigaru spam
-Fixed the indestructible buildings bug
-Siege battles are more balanced
-Autoresolve is more appropriate
-Added custom daimyo portraits for the Date, Honda and Sanada clans
-Replaced the Ashigaru Gashira unit cards to be more consistent with game artwork
-Fixed Teppo Ashigaru uniforms and unit cards for the Ii and Tokugawa
-Wako units are more visually distinct
-Bow units are now slightly more powerful
-Added Kungfuserge's Kojiro and Musashi; both are found in the Grand Kenjutsu Dojo, but you will need to be the Ukita to recruit Musashi and Higo-no-Kato for Kojiro.
-Significantly increased building costs
-Better distribution of units to each military chain
-Heraldry of the Historical Battle of Sekigahara has been fixed and changed
-The map at the top-right of the screen uses appropriate colours to represent the territory/territories a specific clan controls
There are also many other less notable changes in v0.6.
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Updates between v0.5 and v0.55 (to enhance the playing pleasure of the preview):
-A detailed rebalancing of the units, doing well to remove the decisive paper-scissors-rock setup.
-Buildings now have appropriate turn/koku costs.
-All major clans use their yari ashigaru variants and matchlock ashigaru as their core starting armies (some also use more elite units).
-A range of fixes for the Toyotomi monk and his skill tree.
-Fixed the Mogami perceiving the Date as an enemy rather than an ally
-Katakura Kojuro is a Date general, classed as his brother
-New general type: teppo taisho; in the campaign, Masamune and Kojuro have this taisho as their unit base.
-Fixed Omi's -2 food supply issue, upgraded the farm to a "consolidated millet field" and the castle to a 2-tier.
-Fixes from the two mini-patches merged in the main pack.
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The current v0.5 preview shows off the work put into the campaign to date (8th/9th of January, 2012):
-46 new (or in some cases revised) clans, three new rebel types and a new take on the Wako Pirates.
-a new set of playable factions, chosen with the factors of character popularity and a desire to have as few of the old playable clans as possible. (examples can be found below.)
-an overhaul of the campaign map, providing stunningly diverse and hyperbolic textures (examples can be found below.)
-a political alignment system: this introduces a new layer in campaign tactics as each province has their own preferred clan.
-new building chains: vanilla-influenced building chains have been rebuilt from scratch alongside brand new building concepts.
-a re-visioning of vanilla units, a custom unit pack and visual unit variety!
...and much, much more!