Where to catch up on the lore progress of ~ 4-5 years?

[Avalanche]

Firstly welcome back to the forums! I can't tell you what's changed since the latest major update 4.90 in detail but considering you mentioned over the last 5 years I found this information in the mod Readme file which is up until 4.88.6.

It is the year 822 A.S., and with it comes Bretonia's darkest hour. The house Gallia begins their assault on Sirius in earnest by brushing aside the Bretonian Armed Forces and seizing the Leeds system, changing the political landscape of Sirius forever. Governments and regional powers far and wide now seek to respond to the situation, either by launching themselves toward a desperate united front against a seemingly unstoppable enemy, or seeking to use the resulting chaos for their own benefit.

Liberty is in the process of the biggest mobilisation in its history. Rheinland's gambit of blowing the gates in the face of a Libertonian advance has made the leadership of Liberty focus on the greater foe: a great portion of the Liberty Navy fleet is now on the move to Magellan to catch the advancing Royal Navy of Gallia in a pinch. But is the war between Rheinland and Liberty really over, or is the Rheinland Military merely trying to lull the Libertonians into complacency?

Rheinland's plan has definitely brought them a much needed respite. While their overall defence held against any Libertonian incursions, the Munster research facility was lost and the data it held captured. Rheinland is now faced with a prospect of a counter push against a stronger enemy, so that they can regain what they have lost. But even at home troubles multiply: Rheinland's revolutionary movements seized the opportunity before them and struck at a Rheinland whose Military was off fighting at a distant front. The Dresden system has been taken by storm in a show of defiance, and the Rheinland government now has to choose between attempting to solve problems at home first, or committing resources to the pursuit of the stolen Munster base module, before it can disappear deep within Area 21.

Meanwhile in Bretonia a mass exodus takes place: as core planets begin to fall to an enemy far stronger than the previously hostile Kusari Empire, the Bretonian government attempts to evacuate as many people and as much materiel as possible to the newly annexed system of Omega-3. While the Bretonian navy is pushed out of Leeds, the Cambridge fleet pushes into orbit of Planet Sprague, now functioning as the refugee camp of Bretonia. With thousands of civilians and armed forces personnel still trapped on Planet Leeds, the Bretonian government issues an order to all able citizens of the house to assist with the smuggling of these people and the materiel that they guard off of Leeds, under the noses of the patrolling Gallia Royal Navy. But with all the focus on shipping all valuable stocks to the rear there are many opportunities for an enterprising pirate or freedom fighter: the Mollys relocate closer to Omega-3 to hit these transports as a priority, and Corsairs become an even more frequent sighting in the ice clouds of Cambridge. The Bretonians will have to carefully consider how many forces they are committing to the defence of these shipments. Not enough defenders could spell disaster for the refugees on Sprague, but too many may mean that the Royal Navy begins to threaten the seat of power in New London sooner than expected.

Despite the chaos in the south, the newly founded Kusari Republic tends to its own problems, wrecked by years of war and a defiant imperial administration. Contrary to Liberty and Bretonia, the republican government pursues a policy of appeasement with Gallia, seeking greater trade ties to rebuilt its coffers through the resource hungry Gallic state. But while to an outsider the new, non partisan government would seem to have put an end to the struggles between Kusari big business, new troubles are simmering under the surface. Samura executives and rich families are non too happy about their influence eroding away, and they still have more than enough support among the populace to begin stirring up unrest. In response, Kishiro begins to once again work closer together with the greatly rising GMG. Kusari republicans will have their work cut out for them, having not only a political balancing act on their hands, but also the task of rebuilding the economy. They need to tread carefully, as mistakes may once again plunge the House of Kusari into the depths of civil war.

No matter the distance from Gallia, all of Sirius is feeling the effect of the Gallic invasion. Those who see the coming shifts in power, prepare themselves to seize their opportunity from the chaos ahead. Those who are not as farsighted, will be doomed to a desperate defence against these seekers of glory. One thing is for certain: the conquest has only begun.