Abe...based on your post below...you are saying the 928 won't be out till the end of June !! (May 30th availability of S4 + 1 month). That is not what all of the other indications are pointing towards (May release of 928).
It doesn't matter when the S4 launches. By the time the Lumia 928 launches, the S4 will have been out for a month in the US. That means the 928 will get front page on all of the tech websites and probably even VZW's site. All the more press coverage the S4 will get is "S4 available on Verizon today for $199." That's it. The 928 will have first looks, camera shootouts, and reviews all during the week the S4 comes out. The press side of things is handled.
As for consumer mindshare, Samsung has done a good job making the Galaxy brand just like the Droid or iPhone brand. Anyone interested in the 928 will get it. Unless some new apps and accessories launch with the 928, reps probably still won't care.