Twitter Blue subscribers can now upload longer videos up to two hours and 8GB in size. The company increased the limits to attract more content creators to the platform (or at least entice them to return and pay for its subscription service). You don't need a subscription to watch the videos, though.
Video quality is still capped at 1080p for everyone. This update allows iOS users to upload videos in the mobile app, but Android users can only do so via a web browser.