The most visible change you will note is that the action buttons have moved to bottom making it more suitable for one-handed use. We had exclusively shared one screenshot earlier revealing this change. The latest app version still doesn’t bring all the features that we saw in that screenshot. For example there is still no option to show new, unread mails on the top.
Anyways, apart from UI changes, there are some changes in the settings that you can notice in the below screenshots.