Arrow Launcher had it's five minutes of fame back in 2015 when it first launched as a Microsoft Garage Project. A Microsoft Garage Project is a project made by a Microsoft employee during their free time, not as their main thing. It was received relatively positively and now it has officially rebranded to "Microsoft Launcher", dropping the Microsoft Garage badge.
The most interesting change in Microsoft Launcher, compared to Arrow, is the introduction of Fluent Design outside of Windows 10. The new design features a familiar colour scheme and frosted glass effect seen in different variations of Windows 10 and Universal Windows Apps.
The launcher also includes other new features and changes which you can see below:
The Feed — Info at your Fingertips. With just a quick swipe-to-the-right, Microsoft Launcher offers a tailored feed of your important events, top news, recent activities, favourite people and most frequently used apps.
Beautiful and customizable — Launcher has wide-ranging ways to let you personalize your phone, it's easy to set colours of backgrounds, and new "gesture" support will let even hard-core customizers create the environment that makes them most productive.
Continue on PC — And of course, Microsoft Launcher has been designed to make it easy for you to continue what you're working on seamlessly — whether it's photos, documents and more — on your PC
It's not a huge update more than a facelift, some additional useful features and the standard "performance improvements and bug fixes", but it's nice to see that Microsoft is indeed dedicated towards other platforms than just their own. If you don't mind some minor bugs, you can download the preview of Microsoft Launcher from the link below: