Bethesda has finally officially revealed the long-mooted Oblivion remaster, and more information about the game is coming tomorrow, although it's not clear whether the much-discussed shadowdrop will be happening.
In a post on the official Bethesda X account, the studio simply says "tomorrow, 11am EST", pointing to links to the official Bethesda and Twitch channels. The post is accompanied by an image that includes an "IV" logo and the outline of an armored face.
It's pretty clear the post refers to the Oblivion remaster; Oblivion is, after all, the fourth Elder Scrolls game, and the "IV" in the image looks the same as the one included as part of a set of leaked images depicting scenes and artwork from the remaster last week.

If you've somehow missed out on all of this, Bethesda's upcoming Oblivion remaster-slash-remake is probably one of the gaming industry's worst-kept secrets right now.
Rumors of the remaster have been swirling for some time, and the existence of the project was essentially confirmed back in January, when reports pointed to a mistakenly-uploaded website that included information about the game, as well as screenshots.
Following that, new images appeared on the website of developer Virtuos, which is widely believed to be the studio handling the project. Those images included pretty conclusive proof that the Oblivion remaster is happening, including the aforementioned artwork that matches Bethesda's latest announcement.
Further leaks appeared earlier today when the file size of the remaster was supposedly datamined, with reports suggesting the Oblivion remaster will come in at a hefty 120GB. Better clear up some space on that SSD.

Several leakers have suggested that the Oblivion remaster will be shadowdropping (i.e. launching essentially without warning) tomorrow, but the trailer to which Bethesda points is simply titled "All will be revealed...", so we might just be in for an announcement tomorrow.
Either way, it looks like Bethesda's Oblivion remaster is definitely happening. Stay tuned for more.