I just hope they don't go for weirdos again (or, if they do, lets keep their numbers down). I don't mind a couple of strange people, but let's also put in some nice normal people who perhaps lead quite interesting or exciting lifestyles but who wouldn't normally be the subject of ridicule...
I actually think BB4 would have worked if two criteria had been fulfilled. If you had removed 3 or so of the really boring ones (read Scott, Steph, Gos) and replaced them with some more interesting housemates (I dunno - say people like Victor, Michelle and Alex) you would've got a good balance between some slightly boring people who would've come out of their shells more because the nature of the house demanded it (eg Nush, Cameron) and some really funny, interesting HMs who may not have rocked the boat excessively but would still provide lots of entertainment (Anouska, Sissy, Federico). This would have provided a nice balance. There wasn't a good balance in BB4 and as such the lethargic atmosphere of the boring people brought the REST of the housemates down into apathy, instead of the other way around.
The second criteria that should have been fulfilled was partly spoiled due to luck and partly due to the public. The ones that COULD have provided entertainment or rocked the boat a little more were the ones that were nominated and voted off first. Not everyone might have liked them, but people like Anouska, Sissy and Federico were the lifeblood of a successful BB4. If the final six had been made up of Anouska, Tickle, Ray, Sissy, Federico and Tania, BB4 would have turned out a lot differently and would have been much better viewing.