I recently signed up our community as an affiliate and, after the press embargo ended on the 6th, Skylum sent out a bunch of marketing materials along with a link to Luminar 3 installer to try out. It installs along side Luminar 2018 so I've been using both now for the past week or so. I don't know if it's considered a beta version but the version # reports itself as "Luminar 3 3.0.0 (1388)" and no updates have been made available since I first installed it.
I haven't posted it elsewhere yet but I've also reached out to Skylum about getting an additional coupon code for us. During the pre-order (where people get Luminar 2018 now and then a new Luminar 3 license on the 18th) the price is down to $59 instead of $69 but by using our Luminar affiliate link (https://macphun.evyy.net/9Lz5E) and then entering "CAMERADERIE" as the coupon code an additional $10 comes off bringing the price down to just $49.