For all existing ArcIMS customers out there, there has been a change to the ArcGIS 10/10.1 deprecation plan. Version 10.0 was the last release of ArcIMS and there are no plans for any future versions of ArcIMS.
Here is the updated text from the deprecation document:
"ArcGIS 10.0 was the last release of ArcIMS; we will no longer ship ArcIMS in releases after ArcGIS 10.0. With the adoption of ArcGIS Server and the move to 64-bit servers, ArcIMS is no longer the recommended product for producing web maps. While no longer shipped as part of ArcGIS, the current version of ArcIMS (version 10.0) will be continued to be supported as part of the ArcGIS 10.0 lifecycle."
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Mike H., Program Manager
User Advocacy Group, Esri Support Services
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