No pre alpha is not available right now and has no ETA
Hi Ayreon!
Here is a link to our current pledges and what each one offers: https://www.pantheonmmo.com/join/pledge/
As Liav and Kalgore pointed out, the current starting point is the Originator's Pledge which is $1,000 or you can pay it off at $100/mo over 1 year. We have not started any testing yet, other than internal but when we are ready to launch Pre-Alpha we will make an announcement across all platforms and let everyone know :)