What is this strange line-up?
It is a show of the various sizes of new Sonic plushes that have been made in the UK near the fall of 2007. As you see here, they vary from big to tiny, with nearly every size in between!
This photo is from Sonic Team's "Sega Channel" area. (they cover news around the world--but only publish it to Japan)
The quality is just all-right. The noses are a bit snouty, and they look like they have fill/stuffing problems with the wiggly arms and bent up quills. They also lack filled ears, which leaves flappy cloth. The eyes seem well sized and placed, but it is curious to see plushes like this at current time (2007) when they've produced better models in earlier years.

ust how big is the 'big one' in the above photo?
It's THIS big!
Which is about 70cm or 2ft 3inches
With a real cell phone and measuring tape in the photo, you can see they've really made a fairly big one. There is a still-larger one at around 3 feet high, but it suffers the same design problems as these. How can you collect it? Try Ebay.co.uk, or possibly stores (?) in the UK somewhere.
Size specifics & UK locator info thanks to Link.