New
#11
No, 10041 definitely shows the progress bar when installing the new build. I know, I did it on 3 different machines going from 10041 to 10049. It did the same thing IIRC going to 9926 to 10041, but I can't be sure.
In fact, here's a post by Edwin showing the upgrade in progress..
Windows 10 Technical Preview Build 10049 now available