Google today announced that the – oh so annoying to some – "show images" message you see at the top of any email you currently receive in Gmail is going to go away. Gmail will now start to automatically display images in your emails, and is initially rolling out on the web clients with mobile apps will follow in early 2014.
Going forward, the way the images are handled will change so that they're all routed through Google's secure servers first ensuring they're safe and malware free, thus enabling them to be automatically presented to you. The good news is that if you're happy the way things are, you'll still be able to prompt to be asked about external images before opening them by enabling it in settings.
For better or worse, we're getting it, but it's great that we're still given the choice.
Source: Gmail Blog