Whoever started calling 1.5 a patch anyway?....
My definitions:
If I have to pay for it it is an add-on.
If it is a free game update/fix only then is it a patch....
other definitions:
Patch
(n.) an electronic file alteration intended to correct or update a faulty or vulnerable file
add-on
(n.) associated with a program. Add-on refers to an additional feature(s) not included in the inital release,
Probably splititng hairs either way but caling 1.5 a patch has caused a lot of confusion...just read the inquiries..mine included somewhere back when...