Since there are still about 3 weeks till Halloween you can not know if Jasmine Holiday will make an appearance. And no, setting your computers clock forward to the 30th will not reveal anything. An update from Origin is needed,
They are the ones that suggested that I post here to get others opinions on what others think about the event and if you guys feel that it needs to be a constant thing or if you guys feel the same about taking the collection thing away if they are not going to add her anymore. The holiday collections of hers anyways. They also asked me to ask you guys if you think some sort of announcements should be made to let us know if they are not going to have her for the event. That way we can stay well informed instead of doing what I did and going about it the long way. These are the main reasons for the post.
Tech support would not know. Only developers and leads and they have not been known to tell until it is here.
You can lookup an older thread discussing Jasmine Holiday and her merits.
