This colorful petunia is an introduction from Dummon Orange. There are multiple references on the web to Sweetunia Miss Marvel, but all of the labels seen in different plant retail outlets this year that I have observed bear the name Sweetunia Miss Marvelous.
As you can observe in this posted photo, the labels are Dummon Orange supplied and not local nursery generated signs. Wondering if Miss Marvelous is an "improved" version of the plant or just the case of multiple names for the same cultivar?

They seem to be the same plant. Could the name be different for different locations? Where are you located? Some of the websites I found selling 'Miss Marvelous' were in the UK, whereas most of the U.S. nurseries were selling 'Miss Marvel.'

Am located in Central NJ