This bit of info comes from Ed, reporting from the STC mailing list:
Sonic the Comic #222 will most likely be the final issue of the series and will be released in December 2001. It’ll be the Christmas issue, but no word on the stories that’ll actually be reprinted in this particular issue. The next/current issue is 100 reprinted. So in the six or seven remaining issues (Ed doesn’t know where the comic has reached now), it could end even with a reprint of ‘THE EVIL EMPIRE’.