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An anonymous is a cookied user by definition (we could even say it's a cookied-only user since this is the only info we have).
And yes, Marketo will deduplicate on the emall address on form fillout and update the existing contact, if any.
Whether or not Marketo will update the field values (such as the company name) depends on 2 things:
- If the field update is blocked on form fillout in the admin->field management section. If a field update is blocked, the field will only accept a new value if it's empty
- if your Marketo instance is sync'ed with a MSD or SFDC CRM using Marketo OOB connector, and if the person in Marketo is a CRM contact (vs a CRM lead), Marketo will accept company field updated, but will not be allowed to post them to the CRM and the values will ultimately be overridden by the CRM values.