The Sparrow blog:
We’re excited to announce that Sparrow has been acquired by Google!
We care a lot about how people communicate, and we did our best to provide you with the most intuitive and pleasurable mailing experience.
Why does that last sentence sound like they failed at it or are giving up?
We’d like to extend a special thanks to all of our users who have supported us, advised us, given us priceless feedback and allowed us to build a better mail application. While we’ll be working on new things at Google, we will continue to make Sparrow available and provide support for our users.
We had an amazing ride and can’t thank you enough.
Translation: We won’t be adding any features to the app, so you can forget about bottom-posting or any other feature requests. Might not even be pushing bug fixes.
If you are looking for a new mail client, I can recommend and use Postbox. Made by part of the original Thunderbird team, has support for Gravatars, does bottom-posting with selective quotes, does cool things with Gmail, has a great Inbox Zero flow.
I can only hope they do an iOS email client as well someday.