"Actually, I do not think apple will release a 10.4.10 as that would be too confusing"
Don't worry, they won't.
Apple is a creature of habit. It's made them very predictable in some aspects. Sure, you can't easily predict which product they'll release next, and what it's specific modifications will be. But, in general strategy, and behavior you can predict their every move.
1) Apple will always try it's best to keep upcoming products secret.
2) Apple will hype each new release to make it sound like their old one is no longer useful and that you should upgrade right now. Of course, they have a unique way of saying it that doesn't come across so blatant as to offend or upset. But, the end result is people dumping their 2 month old computer to buy the latest one. Works every time.
3) Software updates (Mac OS, iLife, iWorks, and so on), will only go to the 3rd decimal before the second decimal is bumped-up. As far back as the Apple II, Apple has kept this formula. With their dedication to consistent behavior, they'll likely continue this behavior indefinitely.
So, OS 10.4.9 will be the last major release of OS 10.4.x. That does not mean that there will not be future updates to OS 10.4.9. It just means that Apple will not change it's revision number beyond 10.4.9. I'm sure they'll continue to release updates for OS 10.4.x, but it will not change the revision number any. Perhaps the build number, but not the revision number.
I've been regularly downloading updates for my machine with OS 10.2.8 on it. And, it's still OS 10.2.8 even after being discontinued as long as it has been. But, I've found that every few months, they still issue some update for it. With all the updates they've released over the years, if they extended beyond the 3rd decimal, then it would be 10.2.9905 or something by now.
Apple's a creature of habit. 10.4.9 will be the final revision number for OS 10.4.x. Other updates and security patches will likely only change the build number.
Does this mean Leopard's coming out this week, probably not. But, it will be out within a few months or so if history is any indicator.