The spartan browser may be the default (with a user agent string that defeats browser sniffing for IE.) This is the browser that is actively developed, and has shed many of the obsolete functions...
They might as well skin android to look like windows and be done with it.
Sorry to be thick, but will installing the TP wipe the applications that I have already installed on my desktop?
It used to do that when installing Win8.
The most noteworthy thing of this Technical Preview for me is that it feels like the engineers have wrestled back some control from the salesmen and the big-ideas people.
Microsoft is now...
off topic (but still WP8.1): Ask Cortana to dance.
I ran into this when actually searching this keyword. (I'm an avid ballroom dancer.)