Just reached level 60 too so my final rewards for open beta:
Kegs purchased: 37 kegs
Player level: 60/5 = 12 x 2 = 24 kegs
Rank: 15 x 2 = 30 kegs
End season rewards = Rank 15 avatar border + cardsharp title. Top 1000 border + Man-At-Arms title
Gifts from CDPR = Premium Geralt card, classic Geralt avatar, Pioneer title
So 91 kegs + the cosmetics rewards ready to go for open beta. $$
And maybe CDPR will reward some extra kegs as well for the launch, so maybe even 96 or 101 or something. That's gonna take a while to open!
Another new hint at new trailer and looks awesome again:
https://twitter.com/PlayGwent/status/866307627218644992