I thought that they would keep them separate, but I am not too surprised that they combined them.
"I wonder if they are going to put in a path leading from one park to the other?also i guess it doesent matter what side you park on,there will be two gates."
Read the press release. It says that the path will be well themed. My guess would be Gotham City. That would tie BKF to the Batman waterski show. That could mean a name or theme change for RWB. This could be part of the reason for the partial demolision of GR. Last year there was a big grizzly bear overlooking Gotham City.
As for the merchandise I don't know if they would be in a hurry to unload all of it. You may find that there is a Sea World shop similar to the GL shop last year. I don't remember a whole lot of stuff actually saying Six Flags Ohio. Most of it just said SF. In '95 when the Funtime sun logo was dropped for the Jester, and then again in '96 when the jester was dropped for the main gate logo, there was no hurry to dispose of the older merchandise. This may, however, change.
"Problem - no place to stay. Sure, when I'm up in the area, I camp at the state park 15 miles north of SFO (or SFWOA or WHATEVER)."
They have a hotel and a campground already. I think that the monorail system that they want to build maybe to connect these to the park. Also, if you head ten miles south you will discover that Streetsboro has a number of hotels that I can guess are only there the park. S'boro has nothing else to offer but one of the largest selections of fast food places in the country

(I know I live there.)
I would also like to add that most of the rides that they talk about are themed to fit the Marine World side. So yes rides will be coming to that side of the park. Remember that rollercoasters are not the only rides a park has to offer.