Here's a short demo video, showcasing the responsiveness of the new UI. Yeap, it feels like a desktop grade app. K2 v3.x is running on a remote (busy) dev server.
In this first video, I'm browsing and filtering a list of 100 K2 items, by using the top filters as well as the pagination buttons. Then I switch to "infinite scrolling" mode (no pagination, just a stream of all items).
Of course there are various things to "iron out" - design wise - and small bugs, but the functionality is ready!
The next video will feature about 20,000 items inserted in the dev site's database for further testing.
ETA for the beta release for K2 v3.0.0 is set for July 21st (as already noted in our previous blog post). This beta release will be fully functional, but there might be stuff missing and the UI will probably have a few quirks. But a stable (stable as in "ready to migrate your old K2 v2 to v3 release on your production website") will be out late September, early October 2014.
On July 21st, we'll also introduce K2 v2.7.0, with an updated UI, closer to the new UI that's coming in version 3. It will make especially Joomla 1.5 users a lot happier if they don't yet decide to move over to Joomla 3.x!