OK folks, I'll get it out of the way for you:
newbie: "W00t! 10.4.9 iz teh last version of Tiger, bring on da Leapord"
normal member: "No, 10.4.9 is just a version number, they can have 10.4.10 or 10.567.123 if they want to, it's not a decimal point. How could it be a decimal point when there's already two of them in the version number anyway?"
newbie: "Whatever. Leapord iz gunna be out at teh Feb 20th event so 10.4.9 is gunna be teh last Tiger!"
normal member: "There's no way in hell that
Leopard will be arriving any time soon - if there is an event on the 20th which so far there is no compelling evidence to suggest, we might get an extended preview of what's coming but the state of Leopard seeds to developers suggests a long wait before 10.5 comes out - I reckon April 10th will be the day."
newbie: "April 10th? So if I buy a MAC now will I get Leapord for free?"
normal member: "Not unless you buy the new
Mac after the shipping date for
Leopard is announced. Until then you'll have to pay for Leopard."
newbie: "That is teh suxx0rs. Apple is teh ghey."
Right, that's basically the gist of the thread so everyone can go back to their business and we'll probably see 10.4.9 next week sometime. iTunes 7.1 sometime the week after when the

TV ships and after that the next big thing will either be a combined 10.5/iLife '07/iWork '07 launch in April or the latter two titles will get a quiet release in March and 10.5 will follow in April.