As announced on the official Japanese PSU website, Sonic Team will be pulling support for the original PC and PS2 PSU clients starting on October 1st. From this point forward, players will need to have access to the expansion to continue to play online.
It will have been a full three years since the first version of the game had released in Japan. However, after the expansion's release a year later, almost all of the new content requires AOTI to play. In a similar fashion, there are very few users that actively play the original, so the effects will be minimal on the population.
Since late last year, Sonic Team has been offering Japanese players downloadable versions of both PSU and AOTI at minimal cost. The pricing for each is about equivalent to a month of service. In part, this was an attempt to switch more users over to the PC version from the PS2 version. Now, it may also provide a smooth transition for those players still using the original to connect.
Currently, there are no announcements in regards to requiring AOTI for Xbox 360 or international PC and PS2 players.
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