http://www.zdnet.com/article/micros...indows-10-push/

"Spartan will be available for both desktop and mobile (phone/tablet) versions of Windows 10, .....
.....
Spartan is just a codename at this point. My sources don't know what Microsoft plans to call this new browser when it debuts. "
Spartan將同時支援Windows10桌機版及行動裝置(手機/平板)...
Spartan只是開發名稱, 消息人不知道微軟打算取什麼名字來發佈

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看來Spartan是為了符合微軟的Windows10中心概念--即一套作業系統能同時執行於桌機及行動裝置, 包含新瀏覽器也是如此