It will be a few years, but the north end of the Strip will be changing significantly. I am sure that the Riv & the Sahara will eventually end up as new projects too, but since they aren't "big" corporately owned properties, it will be awhile.
Once the new Sky Tower is finished next to the HGVC and the Ecehelon is up then it will really make Circus Circus really stick out like a sore thumb. So MGM/Mirage will probably end up doing something there too, but their priority now is the new CityCenter project where the Boardwalk now stands.
I think that Turnberry did announce a Fountainbleu on the Wet & Wild site but they are also involved in the new Turnberry on Karen ave right across the street from the HGVC@the Hilton.
Wynn has also announced a new tower sometime in the future. I think that it was the vision of Steve Wynn again that relaunced the new building boom at the north end.
I agree too with the comment about Boyd needing cashing & tightening up. We were regular small players downtown, but didn't get our usual comps this year, so once again I found the Golden Nugget our favorite Vegas hotel and playground. The GN is also going to do some new exciting building now that it is owned by the Landry's Restaurant people. A new entrace is being built, and there are pictures of a new tower and a great new pool area.
Vegas, is a great city to watch to see the changes that occur so often.
Enjoy
Rick