Now it's easier to select the right translation because Google shows if they're common and groups synonyms. Another improvement is that Google displays a list of reverse translations for each candidate, so you can pick the most appropriate word. "Reverse translations can distinguish translations of different meanings and reveal subtle differences among similar words. Each translation is now annotated with its most frequent reverse translations," explains Google.
For example, the French word "fort" has a lot meanings, so it's hard to pick between "loud", "strong", "heavy", especially if you don't know English. Google's reverse translations are helpful and it's nice to know that "strong" is the most common translation.
Unfortunately, the new features are only available if you're translating from English or into English.