Expect ArcGIS Explorer in June
Directions Magazine reports that ArcGIS Explorer will be released in June 2006.
Concerning future NASA World Wind releases...
On 3May06 Chris Maxwell of NASA World Wind posted about upcoming releases:
We're going to do a 1.3.5 within a week, and perhaps a 1.3.6 perhaps a month after that. Version 1.5 is a longer-term thing that we expect to show itself towards the end of summer.