In addition to a series of prime-time ads (maybe you've seen 'em), the company has been using certain HTML 5 apps to show devs what they can do using IE 10's deep multitouchsupport.
As if on cue, the very first thing the user tests is the browser's multitouchsupport, revealing that performance could be an issue here -- even on the phone's OMAP3 core -- but the good news is that the presence of Blur doesn't seem to cause the home screen to stutter like we've seen on the CLIQ and DEXT.