Hi Ed. I appreciate your position as a moderator, but it makes no sense to spread hope in a case where the facts are clear, basically.
Jaguar is the codename of 'the next major update to Mac OS X' (Apple-Speak, look at their website).
For the Classic version of Mac OS, it's always been clear that big versions appear every half year (ever since 8.0). I think they were priced at 99$. Hence Mac OS 8.5 and 9.0 were priced 99$. Mac OS X 10.0 upped the price to 129$, for which you not only got 10.0, but also a bundled copy of Mac OS 9.1 (full).
The first major new version of Mac OS X after 10.0 was 10.1, which was a free upgrade, because Apple felt they owed this to their customers, who couldn't really start using 10.0 as their main operating system until the 10.1 upgrade.
Mac OS X 10.2 (or 10.5 if rumours are to be believed), codenamed Jaguar, will be such an upgrade. It'll either be 99$ (if it comes without Mac OS 9.x, which we don't really need any longer by then) or 129$ (if it still ships a classic version of Mac OS).
If at all Jaguar should see a lower price, it won't be free (only paying shipment) like 10.1, as Apple also has to assure customers that not 10.2 is the 'first usable version', but 10.1 already was.
Jaguar = Full Upgrade
Full Upgrade = Full Price