I’ve been writing about the Apple Watch for the past decade: Here’s the rumored update I’m most excited about for the Apple Watch Ultra 4

(Image credit: Future) Apple's "Surprise and Shine" event is confirmed for Wednesday, September 9 at 10:00 a.m. PT / 1:00 p.m. ET. And according to rumors, we can expect a new Apple Watch Series 12 and Apple Watch Ultra 4 to be unveiled.Whether these watches appear and what they look like remains to be seen (I’ll be in Cupertino keeping you updated), but for now, this is the Apple Watch Ultra 4 rumor I’m most excited about.This is the Apple Watch Ultra 4 rumor I’m most excited about (Image credit: Future)I’ve been writing about the Apple Watch for the past decade, and without a doubt, the Apple Watch Ultra 3 is the best Apple Watch for runners, cyclists, and fitness fanatics. I wore the Apple Watch Ultra 3 alongside this Garmin for the London Marathon in April, and was impressed with the GPS accuracy, even through the mile 20 Canary Wharf skyscraper dead zone. Yet I have one pretty big issue with the Ultra, and every model that has been released so far: it’s huge on my wrist, and pretty uncomfortable, especially at night.According to Bloomberg’s Mark Gurman, this year the big news regarding Apple Watches will be what’s inside. In his Power On newsletter, Gurman wrote, “None of this year’s watches is expected to get a major design overhaul, I’m told. Apple is more focused on what’s inside: There will be health and fitness-tracking improvements, along with a long-awaited bump in chips and speed.” (Image credit: Dan Bracaglia/Tom's Guide)It’s thought that these health and fitness improvements will include a new high blood pressure notification, but other than that, it’s unclear. I predict vast updates to Workout Buddy, or Apple introducing an AI health coach, similar to the Gemini coach used in the Google Health App.Yet elsewhere, reports have hinted at a slightly thinner and smaller design for the Apple Watch Ultra 4, a rumor I’m really hoping is true. One day, I’d love to see two different size options for the Ultra 4 to suit different wrist sizes, but this is probably a long way off. Time will tell, but one thing is for sure — we don’t have long to wait. Follow Tom's Guide on Google News and add us as a preferred source to get our up-to-date news, analysis, and reviews in your feeds. Get instant access to breaking news, the hottest reviews, great deals and helpful tips.More from Tom's GuideApple Watch Series 12 rumors — everything we know so far10 Apple Watch innovations that changed the game — from Fall Detection to Hypertension AlertsGarmin’s rumored screen-less wearable just might be the subscription-free Whoop rival I’ve been waiting for Jane McGuire is Tom's Guide's Fitness Managing Editor, which means she looks after everything fitness-related - from running gear to yoga mats. An avid runner, Jane has tested and reviewed fitness products for the past ten years, so knows what to look for when finding a good running watch or a pair of shorts with pockets big enough for your smartphone.