They need to add an auto sort feature that can take the subject or email address and take them to their own folder or subsection and organize the inbox feature. You can do it via making a filter but it is troublesome doing it for every single email a simple auto sort or auto folder / auto categorize feature using the email address from or subject would be awesome so say all your Microsoft emails can get their own Microsoft folder and all your Facebook and YouTube emails can get their own respective Facebook and YouTube folders and can even go further and divide it up further I know the coding is there someone just has to do it.
Much less screen real-estate with the new one. Stuff too big, from text to buttons. Left bar takes more space than before, right bare takes space now too. It feels like it's for people who can't see properly. I'd love it if it kept the same layout as the first one and allowed us to choose how large the fonts are for everything, or keep previous fonts. Features are cool but don't take away the real-estate on your screen.