By default, the K-7 comes with 1 year warranty.
I received the additional 2 yr warranty (3 yr. total) about 2 weeks after sending an email message to Pentax Customer Support requesting it. I attached a scanned copy of the invoice with the email message. The additional warranty also includes a complimentary CLA within the warranty period.
I don't know why Pentax doesn't publicize this fantastic deal.
If you want to know for sure, contact Pentax Customer Support.
If you want to have someone to get the additional warranty for you, you can buy it for not much. See
here and
here.
Read
this discussion thread. There are a few posts related to the extended warranty.