Here is a snippet from an Adobe Knowledge Base article-
"Acrobat and Reader are 32-bit applications on Windows. If you try to open a PDF in a 64-bit version of Internet Explorer, the PDF opens in stand-alone Acrobat or Reader, not in Internet Explorer.
Note: Only Reader 10.1 or Acrobat 10.1 and later support Internet Explorer 9."
No one here will be able to tell you when Adobe will have 64 bit versions ready- mostly because we are not Adobe employees, but also because they typically don't provide dates for this type of thing.. You will need to contact Adobe directly, but I doubt they will provide a date/timeframe.
Hope this helps,