For this year, Kennywood bought all the land down to the Mon river. I'm not sure how stable that land would be or how much room there is for a new coaster, but they wouldn't buy that land for nothing. They also own 21 of the 32 houses that sit next to Kennywood. I don't think they would tear those down since they are for employees, etc.
Personally, I would like to see any B&M. Rumors have indicated for over a year now that it will be an inverted. But when 2004 comes around, will inverts be basically extinct - like standups are now? I would still like an inverted but the only problem is, you can only get a good ride if you sit in the front seat. Seeing how nicely Talon fit in to that small area, I am confident B&M can design a great coaster at Kennywood, whenever that will be.
Yes, I know Kennywood can be a little cheap at times, but they *do* have the money. So rest assured, an SLC won't be coming to Kennywood...or hopefully, no Vekoma product whatsoever.
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Kennywood Insider's Guide
http://kennywood.coaster-mania.com