The first is contained within a post reminding players that the patch preview is not inclusive - that is not every change from the patch is previewed. The post below mentions that Tryndamere will be receiving a small nerf to his base HP regen in the Sejuani patch, presumably to help combat his high lane sustainability thanks to his Bloodlust heal.
There are quite a few balance changes in the upcoming patch that haven't been mentioned yet (Trynd's base regen is getting lowered a bit like Riven's for example, since it was a lot above average). Given its length the patch preview video's just a sample of upcoming stuff and quite a lot of that time was spent talking about the Jax remake this time of coursethe official forums.
The next quip, again from Meddler, pertains to Ashe. While we don't have any details on what these upcoming "quality of life improvement" is, I hope it involves some tinkering on her passive; that thing sure does feel outdated.
Not sure if there are any plans for direct buffs, should have a nice little quality of life improvement soonish though (not this coming patch however).