Here is Jazwares' classic style collection, with Knuckles, Tails & Sonic. These are about 7 inches high each. Certainly, they're more on-model than JW's other plush offerings to date. Even though they're rather small, the detail looks decent as well, with Knuckles' fists being appropriately shaped, & the buckles for Sonic's shoes. Something still seems slightly "off" about their eyes (Tails' eyes too close together?) These will probably be available in Toys R Us stores, Target stores (and online) once the whole 'Generations' toy theme release begins to come out. Price should be about 8.99 each. The material these are made from is very fuzzy and soft. 

Classic Sonic seems all-right all around. He has 1 pointing finger, and the other as a 'thumbs up' as you can see here. The spikes are well defined, and he seems proportional on the whole. His mono-eye looks a little on the thin side (as in, it's not wide enough to be exactly on-model) but his expression seems nice. He's a lot better than their modern version, though about the same size. His tag has the 20th logo, and a classic/neoclassic stock art. He should be about $8.99 at Target & 9.99 at Toys R Us stores. The display for him will be an open-top cardboard box.

• Side photo by SonicDM Side photo by SonicDM
• Back photo by SonicDM Back photo by SonicDM
• Classic Tails photo with tag Classic Tails photo with tag
• Classic & Modern comparison by Greenfox8892 Classic & Modern comparison by Greenfox8892
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Small size classic style Tails looks decent, with all-right expression and good detail. His sock belt even has a buckle (picture of buckle on fabric, seen in left shot below) The 'tush tag' for all these also has the 20th logo on it (seen here) If you're going to be getting small JW plushes, these are decent ones to go with. 

• Classic Knuckles plush from Jazwares. Photo by Taaron. Classic Knuckles plush from Jazwares. Photo by Taaron.
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For some reason, the Classic Knuckles Plush seen here wasn't released with the classic Sonic & Tails small dolls. (They dispense in stores from a cardboard 'box' holder) He started appearing around 2012, instead of late 2011, like the rest. As you can see, in practice, the Knuckles doesn't look quite as good as his Jazwares Pro Photo above. The head makes one of the eyes tilt, and one/both of his fists are a little small/flat. He's not terrible, but he's not really spot-on either.