I’m trying unity 6 out now but I can’t find the serialization package in package manager? Was it renamed or something?
I was able to add it by name “com.unity.serialization” 
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For whatever reason, the Serialization package is not listed in Package Manager even though it now longer is experimental or preview for some time now.
I raised this more than once but thus far it has not appeared. I also haven’t noticed it being used by other Unity packages.
My best guess is that this package is to be considered as “use at your own risk”. I’m personally very much a fan of its binary serialization, it surpasses every alternative and is easy to use.
Was there any news if this package will be depreciated due to layoffs?
No. Serialization is unlikely to be affected. It has been in a “completed” state for a long time now. It’s just not actively promoted, probably because it serves only a small set of use cases where high-performance serialization is required.