We just posted version for PC in the main download section of the website.
This is the first official and final version of 4.0 with a ton of changes and bug fixes.
Pre-Release discount upgrade pricing ends on the 4th so scoop up your upgrades to 4.x now!

We are working on 4.1 already that focuses on speed improvements, but before that is released we will get 4.0 for mac out the gate for our OS X friends.

4.x Lite and Standard for Mac will probably come with in 2-3 weeks, but 4.x Ultra Mac will come around April since it has way more features in it then the other two versions.