I can do you one better. I am not running the beta of iOS 6, but the feature was actually working for me for a little over a week and suddenly today it stopped working. Better yet, AppleCare did not know that you had to have iOS 6 for this feature to work, so they created a case and put me through an hour's work of ridiculous attempts at "trouble-shooting" on 2 separate phone calls. There's even a support article that gives steps to resolve this issue, which doesn't mention needing iOS 6.
At the 40min mark of call #2 I found this thread in the forums and informed the agent. He thought it was funny. He just kept laughing and laughing about it. I told him it was lame and a complete waste of my time. He said, "I'm not happy about it, either." Then went back to laughing. I still have no idea how or why this feature worked from Aug 28-Sept 4. He said, "They must have been testing the feature..." But of course, it wouldn't have been available to me on iOS 5.1.1 if that was the case, but whatever...
It's amazing to me that 2 separate Techs and their Supervisors at AppleCare could not figure out that you have to have iOS 6 for this feature to be active.
AppleCare is just not what it was 2-3 years ago. I continuously have to resolve my own issues while on long calls.
I'll say the feature was pretty cool when it was working.
What is possible for the time being, though, is to bookmark a page on a different device (I am using an iPhone running iOS 5.1.1) and add the bookmark to the Bookmarks Bar.
Surely, iCould Tabs will be brilliant, but for now, at least I don't have to type in the address of the eight (8) tabs I currently have open in Safari on iOS in order to wipe it clean of data (which I do from time to time).
I know this isn't what you were looking for, but at least there's a way to get your open tabs on a different device on to your Mac without much nuisance.
This is sort of like advertising the Facebook intergration and then release it a few weeks after in OS X 10.8.1. I sure did look for it for a while before realising it wasn't in the 10.8.0 release.