Update: Rise of Tribes: Beasts & Bronze is live on Kickstarter, and the campaign will run for 21 days. You may pledge for just the expansion and the Vul'Keth tribe solo add-on, if you already have the base game, or combine them with the Mammoth edition of Rise of Tribes.
On the campaign page, Breaking Games has posted a solo runthrough video, the solo rulebook and the solo PnP.
Our preview post below was published on April 24.
Let's first mention that the expansion box fits inside the base game box. Beasts & Bronze includes new event cards with animals (wolves, cave bears, crocodiles etc.) that players may choose to hunt. The victory condition is different than in the original game: instead of going for points, the winner is the player who first completes three technology cards.
In the Rise of Tribes base game, players exploit terrain tiles for resources (food, stone and wood), and try to fulfill the objectives set by goals cards (e.g. occupy 8 hexes with your tribe). The game is played until one of the players gains 15 victory points. The main board has four actions that players can take: Move, Gather, Grow and Lead, and these actions are regulated by the dice that are placed on each of them. At first, the three dice on each action will show a sun, a moon and a blank side. On each turn, players will roll 2 dice and place them on the action they want to take. The placed die will be combined with the dice that are already on the card, and will determine how successful the action is. If doubles are rolled, the player draws an event card.
Each tribe in the game is different, and the upcoming expansion adds a new one: the Vul'Keth. This will act as the AI in the solo game, but can also be used as an extra tribe you can play in the multiplayer game.