I would say release Stalingrad into CBT for people who have pre-ordered. Since the campaign in coming in a few weeks, why not let people test the campaign.
The big issue, and i see it from a mile away, will be bugs. Let all of us “Bug hunters” report as many bugs as possible so that the launch of Stalingrad isn’t terrible.
Tunisia which had 2 weeks of CBT if i am correct, launched with quite a few bugs, mostly textures missing, and terrible AI pathfinding.
Berlin was in CBT for around 2.5 months and launched also with quite a few issues. AI pathfinding wasnt that bad, but still had issues, and something like the capture objective times were hilariously broken, attackers being able to cap in like 15 seconds, and 1 guy capping all the points before people could even spawn there.
So we can see that both Tunisia and Berlin being in CBT launched with quite a few issues, and i dont even want to imagine what would happen to Stalingrad without CBT testing.
I really see no negatives to releasing Stalingrad CBT to pre-order players. Let them test out performance, maps, AI pathfinding, report bugs, test features.
Give them no progression, maybe 6 default squads like: Trooper, assaulter, gunner, radio operator, medic.
So in conclusion, release Stalingrad CBT to fish out the bugs. Id be happy to report issues on the campaign, so other people could enjoy it at least without as many issues