Here is the official answer to your question:
If you purchase a Sony Creative Software application 30 days before or 30 days after our direct launch of a new version of that program from one of our licensed resellers, you are eligible for a free upgrade to that current newer version of the software.
In order to qualify for a free upgrade, proof of purchase needs to be submitted to the Customer Service department for processing. You can email the proof of purchase as an attachment, or send it by fax to (608) 250-1745.
Include the following items on the fax or e-mail:
1) A copy of your proof of purchase (sales receipt, invoice, or email confirmation).
2) Your full name, shipping address, email address, telephone number and the serial number of the software that you purchased.
3) State whether you want the upgrade delivered as a download or a box shipped to you. If you choose a download, the download instructions will be sent to the email address provided on the fax or e-mail. If you choose the box, additional fees to cover the cost of goods and shipping will apply. Pease include a phone number so we may obtain credit card information to cover shipping costs.
When I bought my first Vegas 6, Vegas 7 came out right after. I contacted Sony and I got a free upgrade. If they still have this policy and you have your receipts, you should be able to get the same...
It worked! So guys, if you bought version 12 within 30 days before or after the version 13 release date, you can just get on chat, ask them, and version 13 will be delivered, in my case, directly to my email.
It says here that the release date was April 7th this year:
in this blog.sony.com announcement they said v 13 will be available for digital download on April 17, 2014 with physical products available May 5, 2014. And that was the date it was available for download on this site.
Great that this worked out perfectly for you. Hopefully others in the same situation will take notice of this.