I'd rather place a bet that the trials will have to be halted early due to technological problems.
It's now coming up to a year since the last trials. A lot has changed since then. They may have updated the platform to take into consideration legal issues but they may not have taken into consideration changes in website technology and changes in user usage.
Users are downloading more and sites are becoming more complex - more sites are embracing web 2.0 techniques. Since 2007 many more users would have upgraded to 'faster broadband' and many would be using different hardware to what they had a year ago. Many would have upgraded their security software and even things like the O/S (windows) would have seen users PCs change significantly with auto updates, service packs etc.
The delay in trials could create new problems which they haven't had the chance to investigate yet.
IMO, if the trials do go ahead they will not be as successful as they are hoped to be. It could be that there would need to be a further trial later in the year.
EDIT: My guess on the exact date when the trials will start?
It will be the day the 80/20 PIA is released
