Not everyone is able to update their device every time a new phone hits the market. It really isn't practical to update more than every few years anyhow since most phones are pretty well built to last. This doesn't mean you shouldn't be able to experience some of the features of the newer phones. Theme dev "Zooyork" has extracted and zipped up the latest boot animations from a few of the hottest devices including the HTC One and the Droid Ultra! He has made them available in multiple screen sizes so they will look great no matter what resolution your phone. Check out these bootanimations from the links below. To apply them simply flash them in custom recovery. You can also open data/local in a root browser and replace the bootanimation.zip with the new file.
HTC One
Droid Ultra
HTC One
Droid Ultra