I've clicked the Photos link from the Google+ navigation menu. The page redirected to Google Photos and it displayed a new message:
"Welcome to Google Photos, the new home for all your private photos. The photos you've shared on Google+ are still available in the photos tab of your Google+ profile."
You can still go to Google+ Photos using this link: https://plus.google.com/photos/highlights, but I don't know for how long. Most likely, Google+ Photos will disappear soon.
Google's mobile homepage looks different. The tabs for web search and image search are now blue and you can finally use the app launcher. Just click the grid icon to see the same app launcher from the desktop site. Many shortcuts will open the corresponding mobile apps instead of the mobile sites.
For now, the app launcher is only available from the Google homepage and from Google Image Search's homepage.
Google has recently changed the color of the tabs from red to blue for both the desktop site and the mobile site. There's now a bigger Google logo at the top of the page and the header uses more space.
The new Google logo stands out more. The latest version of the Google Maps app for Android replaced the gray Google logo from the bottom left corner with a bigger logo that's now colorful.
Here's a screenshot from an old version of Google Maps. You need to look carefully to see the logo at the bottom:
This screenshot is from the latest version of the Google Maps app. The new logo doesn't blend in with the map and it's more distracting.
A similar logo was also added to the desktop site:
Ever wanted to quickly switch between Gmail and Inbox? You can add Inbox to Google's app launcher: just go to inbox.google.com, click the grid icon at the top of the page and then click "add a shortcut". Drag and drop the icon to change its position.
I placed the Inbox shortcut next to Gmail's shortcut.
Inbox has a setting that lets you redirect Gmail to inbox.google.com, just in case you want to switch to Inbox.
Google's homepage has a clever animation that announces a new Google logo. "These days, people interact with Google products across many different platforms, apps and devices — sometimes all in a single day. (...) Today we're introducing a new logo and identity family that reflects this reality and shows you when the Google magic is working for you, even on the tiniest screens," informs Google.
It's not just about the Google logo: many other Google icons will change. "New elements like a colorful Google mic help you identify and interact with Google whether you're talking, tapping or typing. Meanwhile, we're bidding adieu to the little blue 'g' icon and replacing it with a four-color 'G' that matches the logo."
Google's app launcher already has new icons for Google Search, Google Maps, Google Translate, Google News and Google+:
The new icons are better suited for small screens and manage to convey the Google identity using colors and playful cues. Google's logo hasn't changed a lot since 1998: it's still simple, colorful, playful and unintimidating.