This is the sort of update that can add one or two starts to a review score, because it really makes the application far more accessible for the general population. The assumption that I make is that anyone who installs WordPress on their own server and is using a mobile client for most of the work is component enough to write posts in HTML... but that's a very small percentage of the WordPress user base. For everyone else, I think I can finally recommend this client!
In my book that should have been a jump up to at least v2.5, but this is just the next tenth up.
HTML compared to Visual text editing in the WP WordPress client
You can pick up the update from the Windows Store.