According to this reddit thread, there were some disagreements over Armory development.

https://www.bitcoinarmory.com/ is the website of the old project, is abandoned, but still has higher Google rank.

https://btcarmory.com/ is the website of the new project.

I am not sure about the keys.

According to this reddit thread and the comment below, the old Armory developers could no longer work on Armory and the project is maintained by a former employee.

https://www.bitcoinarmory.com/ is the website of the old project, is abandoned, but still has higher Google rank.

https://btcarmory.com/ is the website of the new project.

See Andrew Chow's answer for info about the keys.