After the first initial wave of excitement came over me when I first heard that there was talk of a stand alone Yoda film, I thought that there was no way they could do it without Frank Oz whovoices Yoda. I wasn't even sure if he'd be interested in coming back to the franchise, but I've got some good news for you! If this movie does actually happen, Oz recently talked with Hero Complex, and revealed that he is interested in reprising his role,
He’s in my heart. I know Yoda very deeply.
It's safe to say at this point that Yoda will be a CG animated character from here on out. I seriously doubt they will go back to using a traditional puppet, and Oz agrees,
I think it depends on the story, but I think at this point you can’t go back to the puppet. The reason George [Lucas] did the CGI, which I supported, was that he wanted to tell a story that would have been hampered by the physical limitations of the puppet.
Even though none of this is confirmed other than we will see several Star Wars spin-off films, I think it's safe to say that we'll eventually see Yoda, Boba Fett, and Han Solo movies. All the popular characters will have their day in the sun, and I'm sure we'll see some new ones as well.
I'm just happy that Oz is willing to come back as Yoda if Disney/Lucasfilm ends up asking him back!