Annie Sue would be a hard sell. Piggy is a hard sell, and she has the name recognition going for her. Annie Sue would be mistaken for a Piggy figure that looks weird. Sure the name would be on the package, but most times if the actual figure doesn't catch your eye, you don't bye it (unless you are specifically collecting Muppets). It would be hard to tell retailers that a virtually inknown female pig will sell when the famous Miss Piggy didn't in series 1.
Miss Mousey look like a doll. She won't sell in the action figure section just like series 1 Piggy. One store owner put series 1 Piggy in the doll section and she sold out. So, I would think the same would be true for a Miss Mousey. However, it doesn't make much sense to tell retailers to look through the cases and only put the mouse in the doll section. So again, it would be hard to sell this figure to retailers.
Mildred, who is that purple lady I think, is yet another hard sell. She just some lady. Most people don't know who or what she is. Nothing special looking about her like Uncle Deadly. No theme she would fit into like Lips. Not featured enough like Pops.
Wayne and Wanda probably won't be action figures. Last I heard, Ken really has no interest in them. I believe they were dropped after the first season anyway. Maybe a PVC, but probably not 2 action figures.
Marvin looks fantastic and comes with 6 army builder packins that all look different (Ken said each has a different sculpt). Sal comes with a bunch of pack ins to sell him, plus he's likely to be a repaint or even threepaint. Clifford is a well made figure that is extremly possable and cool looking. He also has some accessory appeal with the mic, cell phone, and clap board. Pops has been featured in the openings during season 5 and he comes with a backdrop to complete the back stage area. Dr. Phil looks awesome and works well with the muppet labs playset. Lips goes with the band and will be the repaint. All of these figures have selling points. Few of the obscure females have selling points, but there are some that could sell.
Emily Bear could sell. She looks exactly like Fozzie dressed as an old lady. Even if you don't know Emily, you know Fozzie. It's an easier sell than a mouse with no real relation to anyone in the collection. An adult Skeeter (if Henson allowed it) would sell because of Muppet Babies and the relation to Scooter. Janice sells well because she is a fairly well known character and is a band member (band members tend to sell well). Astoria could sell because she looks just like Statler, another known character.