It's no surprise, but Apple is expected to be holding an event in March. According to a report from iPhone-Ticker (via 9to5Mac), that event will be at the end of March, likely on March 31. While last year's spring event was focused completely on services, this one is more likely to be focused on hardware.
One device that's expected to be announced is the iPhone 9, iPhone SE 2, or whatever else you might want to call it. Meant to be more of a low-cost alternative to modern iPhones, the iPhone 9 will keep the home button. In fact, it's expected to pretty much be an iPhone 8 with updated internals, similar to how the original iPhone SE was an iPhone 5s with updated internals for those that wanted the older four-inch form factor. According to the report, the iPhone 9 will launch just a few days later on April 3.
Another thing that's likely is that Apple could launch new iPad Pro models. It's been nearly a year and a half since the Cupertino firm first announced the latest 11- and 12.9-inch models, so those could also see a spec bump.
While the report isn't confirmed by any means, it matches the timeline for when we're expecting these new products. Press invitations will likely be sent out a week or two prior to the event.