Yes I've also just started adding sub-word lookups for ranges inside of the headword and for words appearing in the definitions. I hope to launch that together with Yomitan dictionary support. There is a lot packed into this next update...
Here is a look at the new learning status screen, too: https://media.discordapp.net/attachments/1209908367821373500... Overall navigation should be much easier to understand in this update.
And the new ebook bottom navigation, when it is not hidden: https://media.discordapp.net/attachments/1209908367821373500... (I will later move the scrollbar into the "..." menu like Apple Books to further minimize)