Because the Edge app has a new app ID, testers will lose favorites, cookies, history and reading list items they saved in Spartan in previous preview builds to be lost.
The new build also includes a number of UX improvements and refinements; improvements to Cortana; a Flashlight quick action option; and an updated Photos app via the Windows Store beta.
Unlike Build 10136, today's build doesn't require those who want to get it to first go back to Windows Phone 8.1. Microsoft fixed that single-hop problem, and testers who either stayed on 10080 or who did go to 10136 can get the new test build.
Like Build 10136, the post-upgrade migration status screen is missing in the new build, which means testers might have to wait for up to 10 minutes to get the date/time lockscreen to appear after getting the new 10149 bits.
Windows 10 Mobile is expected to be released to manufacturing later this year. Rumor has it that it will be available on new phones and start to roll out to existing Windows Phone users later this fall.