I'll give IPB credit for not being a bunch of boring stiffs with their announcements lol
I wonder how long it will take for XenForo to implement these features
GIFs are always nice, although I'm not sure about whether a "meme button" is a good idea.
Also, lazy loading doesn't actually speed up page loads, it actually makes it significantly slower on slow connections and same-y on fast connections, it's an anti-pattern.
With lazy loading, you scroll down to the images and have to wait five seconds for them to load on a slow connection rather than just having them be loaded already, I've run into that problem on some sites and it drives me nuts.
When we first implemented the letter avatars in 4.3, we discussed whether to use CSS styling or use an image.
We decided to go with an image as it was more stable over lots of different devices, including email.
We've revisited this in 4.4, and switched the letter avatars to SVG, which are much faster to render now that the browser doesn't have to load the image files.
And this isn't actually true with HTTP/2. Icon fonts have issues for a number of reasons, partly because they have a thousand icons you will never even use, but not really images. Instead, it will make the page more bloated, even if you have the images already cached.
Lots of good ideas, but IPB seems to have made some mistakes here and there.