Walt Mossberg from AllThingsD claims to have had the privilege of testing street-view in the Google Maps Web App:
Google plans to announce on Thursday that it is adding its popular Street View feature, missing from Apple’s maps, to the Web version of Google Maps accessed from the iPhone and iPad. I tested this addition, which displays 360-degree photographic street views of selected locations, and interior photographic views of certain businesses, using sample links Google sent me. These links worked well, allowing me to see the locations and pan around with a finger.
I hope Google will deliver on this claim, however…