Apple will unveil watchOS 27 and its Apple Watch improvements next week at WWDC , here are three new features rumored to be announced. #1: Upgrades to heart-rate tracking and high blood pressure features Mark Gurman has reported that watchOS 27 will bring improvements to the Apple Watch’s heart-rate tracking features. No specific details are known, but the improvements are expected to be supported by current Apple Watch hardware. Rumors indicate Apple Watch Ultra 4 may add a lot of new health sensors , so it’s possible Apple has even more feature improvements coming for new hardware. Additionally, a recent Digitimes report said that a new high blood pressure notification feature is currently under review by the FDA. This is almost certainly a new feature coming in watchOS 27. #2: New Modular Ultra-inspired watch face New versions of watchOS consistently bring users new Apple Watch faces.…