From the update:
Our Assimilation Alien Host Kickstarter has hit $24,000! Unlocking the massive Alien Fiend.
The Fiend can be added to pledges for $20. This monster is even more alien than the rest a pure prehistoric beast. Some grubs grow beyond that of the wyrm and become fiends. 5-6 inches tall.
Host pledge level will get a free Queen and 3 more Swarm Adults. Swarm pledge level will get a free Alien Wyrm and 5 more grub. While Queen pledge level will get a free fiend and 2 more flyers.
Also at this stage the Host pledge level have the option to replace all their plain slotta bases with decorative bases for $25, Swarm pledge level can do the same for $30, and Queen pledge level for $35. That will be a ton of extra bases cheaper than the base pledges.