Below are some of the changes you may notice from our April and May releases - May was just deployed last week.
RoadTest
Review scores will now be displayed in product popups.
In a previous release, we added an "Engagement" widget to most pages to show the number of views, likes, comments, etc. (varies by content type), but it wasn't showing up on RoadTests or Reviews - it is now.
We've fixed an issue where the number of applicants for a RoadTest wasn't correct.
Videos:
We've been working on optimizing and improving the way videos upload and render on the site. Most of these are behind the scenes, but they should help to improve the overall experience. One thing you may notice, however, is that you can now embed YouTube playlists.
Search:
We've added a little more explanation of search filters and renaming a couple of filters for clarity...
...and adding products to the sidebar of the search results page, to make it easier to get to them when you're looking for them!
Registration:
Our registration page now clearly outlines the requirements for usernames. (Since most of the people reading this are probably already members, this may not be very interesting to you, but hopefully it makes the registration process a little quicker in the future!)
Gamification:
We've also added a new Achievement, Share the Love! You'll earn this for your profile when you Like 20 pieces of content across the site, and 10 people Like your original posts.
We've made some general tweaks to the mobile layout of the site that should make it easier to navigate on your mobile devices, as well as a lot of behind-the-scenes updates and fixes. As some of those aren't that visible (or interesting) they don't warrant a lot of detail here. 
element14 Development Team