Seem very similar to Mail Pilot (www.mail-pilot.com), although Mail Pilot seems that it will still be a monthly paid service, as .Mail app doesn't (at least I couldn't find if it is).

Which is a big deal for me. As for .Mail seems like you pay for the app such as Sparrow (which it looks similar too) and not have to pay monthly for it.

I plan on buying it if it comes out as it shows and does what it does.

Anyone know when it is coming out? And if it will have a monthly cost?