The modern figures don't represent any one game or period, other than that the characters' styles are all "Post Sonic Adventure", so any game the came out after that, is eligable for one of these 20th Anniversary figures. Here is the MIB shot for Sonic & a Spinner.
You will notice right away problems with the date they're using. Remember: the Dreamcast (and SA1) were released on 9.9.1999...so 1998 is wrong for the USA. Will they do a second run of these with fixed dates? It looks kind of funny/fishy this way because the very FOCUS of the line is about DATES and then they got them wrong on the box. 

Spinner- This is a levitating robot with blade like 'wings' on the sides. These DO articulate, you can turn them independently for posing. It will not sit upright as the base is rounded. The detail here is good, with various 'seam lines' and appropriately applied paint.

All of the modern style 3.75 inch size figures have the same box back. It has CG modern Sonic, the logo and the same bio for him as what's on everything else.

Each box card has a scene from a game behind the character (hard to see with the figures on the cards still, in photos) Tails has Sonic Colors scene --but it's VERY pixelated, it seems quite low-res, which is strange. Shadow (center) has part of City Escape's hills, and Sonic has Speed Highway from Sonic Adventure 1.

While the figures are technically repeats, there are some small differences. The legs will be streighter/less 'knobby' as seen with comparison to the left. (Right side is new figure) Shadow can tend toward more paint flaws/over-spray--so again, watch before you buy. The Tails may be darker orange, while Sonic's beige parts may be yellower.

Photo by SonicToast

Since the figures (3.75 size) releasing with this MODERN set of badnik robot accessories are all just re-releases with the stronger plastic joints, the figures themselves WONT be reviewed here (See their regular 'JW Small Line' page for review, since they are basically unchanged) These guys represent a good opportunity for new collectors, but are a forced-re-buy for anyone else

Photo by SonicBoom403