I thought I ought do some searching since I asked the question.
As advised, there are a few snippets on Autosport.
I don't have access to the older archive, but a few headlines
In summary, all I found news of was 1. new soft compound at Brazil (having been tested Abu Dhabu Young Drivers, Germany), 2. new hard compound at Spain (having been tested at Turkey)
25.11.2011
http://www.autosport.com/news/report.php/id/96478
Paul, it's interesting that Jenson Button said yesterday that he felt that at the beginning of the season your [Pirelli's] policy has been somewhat more extreme perhaps with the tyres dropping off quite dramatically whereas perhaps more conservative later on in the season. I think you have already said that you will be less conservative next year, but can you talk about your policy for next year.
Paul HEMBERY: Well, first of all we didn't change anything, so I think there are a lot of other factors involved why maybe there is not that big drop that we have got now. The only thing that we did change was the hard compound after the Turkish race. Next year we are going towards softer compounds. We have too big a gap between some of our choices this year in terms of peak performance so we are trying to get that down below a second to try and encourage the strategy. Experience and hindsight are wonderful things and we can make maybe some more aggressive choices in some circuits.
21.11.2011
http://www.autosport.com/news/report.php/id/96376
"Pirelli will give a new compound soft tyre its racing debut in Brazil after a successful trial in Nurburgring free practice and last week's young driver test in Abu Dhabi."
07.08.2011
http://www.autosport.com/subs/login...m/news/report.php/id/93680&type=news&id=93680
"Ferrari's chances in this year's championship look set to be boosted, with Pirelli having revealed that it is unlikely to use the hard tyre in the remaining races of the season.
The Maranello squad has been known this season for preferring softer tyres that adapt better to its car."
18.07.2011
http://www.autosport.com/subs/login...m/news/report.php/id/93174&type=news&id=93174
Pirelli wil try out a new version of its soft tyre in Friday practice at the German Grand Prix.
The tyre firm's motorsport boss Paul Hembery said the revised compound was part of efforts to make the Pirelli range slightly more durable to ensure the number of pitstops in races did not become excessive.
17.05.2011
http://www.autosport.com/subs/login...m/news/report.php/id/91465&type=news&id=91465
Pirelli has confirmed it will introduce a new harder tyre for the Spanish Grand Prix, having tested the compound in the previous event in Turkey.
The compound, trialled during practice in Istanbul, is more durable and so will increase the gap between the prime and the option tyres, offering the teams a wider variety of strategies for the races.
06.05.2011
http://www.autosport.com/subs/login...m/news/report.php/id/91173&type=news&id=91173
Pirelli expects to allocate the new more durable tyre compound that was trialled today as its regular hard compound tyre from the Spanish Grand Prix onwards.
The hard tyre has not proved to be as durable compared to the soft as was hoped, particularly on more abrasive tracks such as Sepang. But Pirelli motorsport director Paul Hembery is confident that the trial compound is an improvement.