Fro-yo girl here. Following up on a tip from @badrobot68, I walked over to 4th and Union and spotted the future Red Mango shop at Rainier Square. The doors were open so I peeked inside and saw that the wall for the fro-yo machines was in place. There’s space for five machines. Also, the signs indicate that this will be a self-serve location with fro-yo and smoothies.
You know you love me. X0 X0, fro-yo girl.
* RED MANGO: 405 4th Ave., Seattle, WA 98104