limpid sun
Can someone clarify if the Beta is limited to the first device I download to or can I access it from any device connected to Steam? 
Other betas from other companies terminate beta access if accessed from a different device. Some allow multiple platforms but testers get limited to the first device for each platform (e.g. one pc, one mac).
uneven osprey
Can someone clarify if the Beta is limited to the first device I download to or ...
Thats a good question. Technically, I am not aware of any limitation like that and if I remember correctly we haven't had something like this in place for alpha. But I will check again.