The release schedule announced at GenCon and RatCon listed upcoming releases in the following order (subject to change of course):
- Shadows of Europe
- Mr Johnson's Little Black Book
- Loose Alliances
- Shadows of Asia
- Running Wild
- SOTA64
- (possible adventure set)
That means
SOTA64 is probably at least 5 books away, which in my mind says late 2004.
Also note that Amazon.com's data on SR material is unreliable at best - they've even been known to list Battletech Classic material as SR sometimes and vice versa. Your best choice for updated info is still the
official SR website and these boards

.