As announced, there will be no more GM-driven invasions.
That doesn't mean BT will become peaceful. However, the new invasion system is a lot more player-driven and a mix of PvP and PvE. It is really simple and brilliant. Here's how it works:
With the defeat of the Daimon Dominion, everyone on Beluaterra is relieved, but has also had their eyes opened to other worlds, to magic and to the grim realities of life. Witchcraft and sorcery are taking hold amongst the population and while most of it is harmless charlatanry, some of those witches, warlocks, sorcerers, hedge magicians and what else they call themselves are making you nervous.
Guards and militia throughout the island have been instructed to be on the look out. It is feared that all this wild magic would cause more evils to stir in the night...
OOC Information:
There are two new magical scrolls added to the game, Summon Monsters and Summon Undead. They do exactly what you think they do. However, there is an additional way of finding them, aside from adventurers contacting wizards: They can be found when you are a region lord and your guards burn a witch. This is a random event, there's nothing you need to do.
One of those scrolls alone won't do very much. It might be a small nuisance. But if your realm begins stockpiling them... and then uses a lot of them in the lands of the same enemy... not all in the same region, but say one or two in each of his regions... or send your local invasion to the allies of your enemy so they are busy and can't help out... or... there are so many options...
The base concept is that there will be fewer and smaller invasions, and you the players will trigger them. And what a burnt-earth strategy for a realm being conquered by a superior enemy...