Material design isn't the be all and end all, there are other ways to go about things of course, but it's a pretty good way to go - especially you're trying to stay current.
Taking that on board, albeit somewhat later than most, eBay have brought a stark change in style to their popular native app's UI.
Going beyond this, the UX of the app has changed drastically, making some major shifts which users will be thankful for.
Better late than never, 5.0 represents a serious overhaul and hopefully a smoother experience the next time you have to bid on a used bin at 4am.
There’s certainly a little more Material Design here than there has been in previous versions of the app and in terms of color, eBay have gone for a blue look and feel, with recent searches and such standing out much better on the home page. This is something that might confuse some people that have been so used to the previous look and feel, but those now more accustomed to Material Design apps will appreciate these changes that have been a long time coming.