CBS just came out with the price for the new feeds, it will be about $24 if you buy before the season starts and $27 thereafter. Not bad, considering that it will still include all of the important features such as flashbacks (now called the archive), online chat rooms, mobile viewing, and all that fun stuff.
The bad news is that anyone outside the US cannot sign up for the feeds. This is unfortunate since there are a lot of Canadian BB fans! People are already starting to find ways around that though, through VPNs and such.
I've also heard another dubious rumor that the twist this year might resemble that of season 6, where secret pairs entered the house, and if a pair made it to the end without anyone finding out they already knew each other they would get a bigger cash prize.
Who knows what's real and what's not at this point. Either way I think it will be a good season, I feel optimistic!