I'll be honest i've been out of the loop with what's going on with the Swivi LCD, but it did get a fairly decent review from EOSHD.com. It basically adds a large 5.6" LCD to cameras that lack a Vari-Angle LCD, and provides Focus Peaking, and HDMI pass through. Below is the demo video about the Swivi product features.
Just got news that the Swivi 5.6" HDMI LCD is having a 24 hour sale (also includes LP-E6 type battery and charger). Most retailers are offering product from $370-470 dollars, but for the next 24 hour sale it's been listed at $275 via Amazon (Click Here).
Swivi 5.6" HDMI LCD Screen - via Amazon
Also available on eBay for the same 24 hour sale price (Click Here)
Swivi 5.6" External HDMI LCD 24 Hour Promotion- via eBay