According to the HiSoftware’s press release Accessibility Kit for SharePoint (AKS) v2.0 will soon become publicly available.
Originally planned to Q3 2008 AKS v2.0 was supposed to provide us with some new features improving delivering accessible websites in MOSS 2007 among which XHTML compliancy and a new Accessible Rich Text Editor (aRTE). Unfortunately for some reasons, the release has been delayed until now.
Just recently HiSoftware has announced that AKS v2.0 will soon be publicly available. You will be able to download AKS v2.0 from the HiSoftware website on March 9. The aRTE will become available a week later on March 17.
Check out the full press release @ HiSoftware.com: HiSoftware & Microsoft Announce Release Dates for SharePoint Accessibility Solutions