Light Peak was pushed to 2012 by Intel
Well technically Intel is targeting 2011 for their contribution ( delivering parts ) and expect the system and peripheral vendors to really launch in significant way in 2012. Intel is still hoping that will turn out to be "late 2011".
http://www.eetimes.com/electronics-news/4207750/Intel-Light-Peak-switches-on-in-2012
The really isn't too much different than USB 3.0. NEC (now Renesas since they bought that product line) had controllers ready in May 2009. It wasn't till January 2010 till there were several peripheral announcements. Now there are 120 products on market. However, there were a relatively small number of USB 3.0 products shipped in 2009.
Fact is a good fraction of the stuff that is going to be released in 2011 is already in design freeze. If Intel doesn't pragmatically release until 2011 they won't be able to win slots in new designs until then. Those 2011 design freezes end up being mostly 2012 products.
It is still the case that there is little public support/commitment from peripheral vendors for short term future deployments. PLX doing a PCI-e v3.0 to PCI-e v3.0 demo isn't something that most folks are going to buy and indicative that aiming at Fall 2011. PCI-e v3.0 won't arrive till then.
The video has some products from AVID and maybe WD . The AVID product seems to be acting as a hub, not sure the topology, since it has 3 LP connectors plugged in. That should mean there is two Intel controllers inside ( unless they have added to their line up. Perviously shown controllers only took two connectors). The WD is a maybe because it was only a logo on the storage box. Unclear who really built that box. The drive vendor was only explicitly tagged and pitched drive specs. The monitor was likely still hooked into some external LP adapter. (hard to tell with the quick pan video work... but most likely true.)
I think Light Peak will be much more quickly adopted by the $1,000+ peripheral vendors. That means that the MBP 17" will likely get this first out of all the laptops.
For this iteration of MBA unlikely because requires another separate controller. Even if the controller was shipping that would be a problem.
As the EETimes article points out, by the time that Light Peak gets rolling, USB 3.0 will likely be shipping on 10's of millions of devices. And that's even before USB 3.0 gets weaved into the most mainstream chipsets.