Intel just sent a quick note through the Tizen General mailing list to expect instructions on flashing new images to Tizen devices. According to Siram Ramkrishna, Software Engineer at Intel:

There has been some questions on instructions for flashing new images to devices for Tizen. We are working on getting that documentation out to all of you. I hope to have this complete by either Friday or Monday.

Stay tuned.

Links: Tizen General Mailing List