I was doing a bing search for anything new in the last month and found this page.
1- can’t read it.
2- not sure if it’s legit or a fake
3- wonder if it could be a legit comparison.
https://www.wielrenner.eu/beste-fietsnavigatie/garmin-edge/840-review/
In any case, need a new Garmin/Wahoo, so hoping it’s true.
If you use google translate, you can see that it is just someone speculating what an 840 would look like. Not a leak, or an inadvertent early release of a review.
Thank. Not technologically aware how to use google translate.
ha, well, your post had me so excited that a new model had been announced that I had to check for myself. 
Sorry about that. My 520 and early ELEMNT are past time to be replaced (technologically and battery life), but I don’t want to buy only to find out a week later a new and improved model is out. Guess the chip shortage and global supply issues are affecting the bike computer manufacturer like everyone else.
Garmin’s top three bike computers are old relative to the market and other competing products:
530 released April 2019 - 3 years old830 released April 2019 - 3 years old1030 Plus released June 2020 - 2 years old (though the core 1030 from 2017 is almost 5 years old)
.
That’s simply a garbage click-bait post. In fact, it doesn’t even rise to the level of clickbait, because it’s just trash.
I rarely comment on rumor type stuff, but that post is simply someone that’s SEO-turfing, basically, trying to solidify Google search rankings through keywords early on with fake pages. In this case, they’ve merely taken an Edge 530 review and done a ‘Find → Replace’ with Edge 540. After all, everything in that post is actually mentioning what was then new Edge 530 features. Also, they added in Edge 1040 for a bit more SEO juice.
Ultimtaely, all this does is make it harder to find legit review of products down the road - especially for other languages beyond English where there isn’t as much content (this one is in Dutch). By adding links to it from sites like Slowtwitch (which Google considers more authorattive), it’s only further increasing the credability. I’m all for enjoying a good sports tech rumor, but this doesn’t even rise to that level, since it’s just find/replace on an old review.