This year, Google certainly will launch new services and intensify their SERPs:
product search, flight plans, video and image thumbnails, local search ....
Therefore, it´s getting more and more important not to rank just for a specific keyword, but to optimize your sites also for images, videos, local search an to create valuable social media content and to get followers.
I tend to agree that social signals will increasingly factor into the results pages, particularly G+ business pages. On that note, I'm not convinced that amassing a huge following will have much as much an effect as frequency of posting.
In 2012, Google+ will be the spammer's dream; copy/edit ridiculously/paste away!
I think there is no new tehniques. All old techniques are there...but the important things is quality.
High quality content
Quality of back links.
How frequently you are udating content.
back links should look like natural
Your brand name and logo design should be unique so that people can rember both easily.
Will, I think no any latest SEO technique is coming in 2012. I daily work on Forum posting, blog commenting, bookmarking, directory submission, classified, article posting, rss submission and ping submission.