Until now, Google only displayed the "share" link next to the results, while "cached" and "similar" were buried in the Instant Preview box. Instant Preview is no longer available.
Bing has a similar feature and Google probably decided to test it and see if it works well. Before accusing Google of copying a Bing feature, it's a good idea to check Bing's interface and see that it looks a lot like Google Search.
Here's a Bing vs Google screenshot for [ny times]: