While Rockstar Games is known for being pretty tight-lipped when it comes to revealing pretty much anything in advance, it's also known for being a creature of habit. Some things happen like clockwork, especially when it comes to GTA Online's schedules.

One such thing is DLC being released on Tuesdays. It being Monday and the end date of a round of discounts was already indication enough that Rockstar may release another minor vehicle DLC tomorrow. However, a new set of previously — and still — unannounced discounts and bonuses further suggest that this is indeed the case.
A number of new discounts and new loading screens have been reported to show various promotions that are presumably part of the upcoming event, however have been activated in advance. While it isn't the most impressive lineup of discounts, the items on sale are some of the more expensive ones, meaning you'll be saving a lot of cash if you buy now.