This is good news.
Yongnuo's ST-E2 was actually superior to Canon's (rotating head, A-B:C compatibility, greater reach) but Canon crippled the 5DIII so it wouldn't work).
Before I switched to the 600 R-T, I had the the 622 Triggers and never had a problem with them. I was very impressed with the quality.
I'm liking that another third-party manufacturer (like Sigma) is adding the ability to update firmware, which will make it harder for Canon to pull another 5DIII stunt.
I agree, I wish they were offering a receiver. But then, I sold all my 580IIs so not much point for me now. I'll be interested in what their prices are. I wouldn't feel comfortable relying exclusively on Yongnuo strobes, but as a supplement or backup, I'd be very interested.