Update: not working anymore
1DAYPREMIUMCRIF2020
Gives 1 day of premium.
A special badge dedicated to the new event on the Global Map “Metal Wars” has been added to the 1.9.1 game files.
“Metal Wars Hero” badge:

PS: have fun watching the SpaceX launch here: https://www.youtube.com/watch?v=bIZsnKGV8TE
Give 30 Battle Pass stamps.
UPDATE: Appears to not work anymore.
Gives 5x Personal reserves: + 25% credits for 2 hours.
The style is available in Season 2 of the Battle Pass.
Historical, valued at 3,000 gold. Only for the TVP T 50/51 tank.

Description:
From the diary of A. M.: „Today I did what I had to. It was pure luck to run into Kilmore’s unit at the very moment when his guys needed additional fire support. I might not have been their savior, but my assistance really came in handy. I believe so, at least! He started nagging at me again, but this time, I didn’t feel the anger that had been in his words before. I just want to prove to him that I can handle a tank as well as a scalpel. I can be a really big help on the battlefield, not just at the hospital. If he stops being so stubborn and allows me to fight, he’ll see that I’m the trusted companion he needs.”
Source: wotclue
The surf boards are from the „Apocalypse Now” movie:
https://youtu.be/aPISvQt_Egg?t=83
The style is available in Season 2 of the Battle Pass.

Historical, valued at 3,000 gold. Only for the M48A5 Patton tank.
Description:
— From the diary of D. K.: \”What is this girl up to? She wants to prove that she has strength and courage? We can already see that, but she also seems to lack a basic sense of self-preservation. Sooner or later, her vehicle will get blown up and we’ll lose such a… true professional, damn it! She’d better stay at the hospital to help people and work miracles. But I have to admit that without her assistance, we would have lost one of ours on the battlefield. Well, if she’s that brave, I’ll give her my surfboard when this all ends… If it ends.
Source: wotclue
In the new battle pass, you will be able to get one of two unique Commanders.
„Cutting through the standard progression will give you the chance to get any style or commander in your hands. Everyone with an improved pass will also be able to get a second style. If you bought an improved pass, just pick the tank with the commander you like the most. The style of the second tank will be transferred to your account later, without a commander.”
Angela Milotova (only for Czechoslovakia)
– She’s a determined and headstrong lady. In her childhood, she learned the specifics of tank combat from her father. However, later on, she followed in her mother’s footsteps and studied medicine. After graduating from the Academy, she had a good track record in field hospitals but insisted on transferring to a tank unit where she hopes to realize her full potential as a tank commander.
Damon Kilmore (only for USA)
– An experienced commander who’s always cool and calculating. During his 20 years of service, he’s braved many challenges, earning his own command while receiving the respect of his comrades-in-arms. He likes to win with honor, keep strict discipline, and comply with the rules of engagement. Due to its outstanding performance, Kilmore’s platoon is something of a legend. As an avid surfer, he keeps his surfboard nearby as a good luck charm.