Hi Martin,
That's correct - it's what's known as a "Limited Customer Ship" or LCS release. This is the first time we've used the support site to distribute it. In part because the new R700 802.11AC access-point requires this software version (9.8).
We don't let an LCS release go out with serious known issues, but there are several known issues (see the release notes) it went out with..the purpose of this phase of our release cycle is to get code out for early adopters who might need a particular feature (or bought an R700..), but it is not yet the level of quality we would designate as "general availability" or GA (which will be a later 9.8.0.xxx release).
Make sense?
-Keith