Instant visual translation is when you point your Google Translate app at a sign or text on a page and it instantly translates the text to your language. Here is an animated GIF of it in action:
Google launched this feature earlier this year supporting English, French, German, Italian, Portuguese, Russian and Spanish. The following languages have now been added: Bulgarian, Catalan, Croatian, Czech, Danish, Dutch, Filipino, Finnish, Hungarian, Indonesian, Lithuanian, Norwegian, Polish, Romanian, Slovak, Swedish, Turkish and Ukrainian. You can also do one-way translations from English to Hindi and Thai.
The picture mode, i.e., not instant translation, works with 37 languages, by the way.
The new app is rolling out for iOS and Android over the next few days.
Google made some other improvements to their translation, which you can read about on their blog.