Not quite right...
Severance is 3 weeks per year of service to a max of 60 weeks. The 4 weeks is included within that amount and it's jus the portion everyone gets whether or not they sign a release. Anything you get beyond the 4 weeks you have to sign the release to receive.
You'll also get 3 weeks paid notice. Most people don;t have to work during this period, but f you EOI you may be asked to work it or at least some of it to transition work.
Also as part of severance, you'll get outsourcing help and a training budget of $2K to help you get another job.
COBRA is definitely not worth the cost. Go on the marketplace and find something to help you cover the gap.
Unused vacation (including anything carried over) is paid out. Not sure what the other poster is talking about with accrued vacation, but that's not right. Whatever you haven;t used, you get paid out. Read the vacation policy online...it's spelled out there.
And yes, prorated VCIP paid (assuming VCIP is paid at all next year) and any remaining RSUs will automatically vest and they will be in your account about a month after your termination.
Read policies...everything is online and you can find all this out accurately for yourself. Lots of what gets posted here is speculation and just plain wrong. Not maliciously so, just people think they know what they're talking about, but they don't quite get it right.