The buttons have been replaced with a taskbar at the top and bottom.
The traditional menu icon only appears when it is needed.
A screenshot of my homepage...
I am getting used to the new way of doing things, and actually prefer it.
Tapping on the date/time/battery icon gives a pop-up with the remaining juice in the battery, as well as another icon where you get shortcuts for airplane mode, notifications, wi-fi setup and general settings.
Tapping on the paint pallette brings up the personalize menu.
The apps icon still opens the apps, just in a better way, in that the last view is opened.
The microphone in the top left opens the speech search engine, and once you learn how to pronounce words "correctly" it works well, taking you to a google search where the words you spoke are translated into a google search.
The pen now works as a stylus.
The traditional back button is now in the lower left corner. The home icon still brings you back to your homepage. Multi-tasking is easier with the folder icon, that shows the last recent pages you had open, and opens them for you.