That's the rumors, yes. The planned Vince/HHH struggle for power has been set in stone for quite awhile, even before any of suspected or saw Triple H turning heel. The original thought was that HHH would take control of the company from the tyranny of Vince and would do so as a baby face by competing against someone of Vince's choosing at Mania. But those plans have obviously shifted a bit. Now it appears as if Triple H and Stephanie will become tyrants themselves and eventually realize they're perfectly capable of running the company on their own without "the old man's help." Maybe the Board Of Directors for whatever reason will attempt to vote Vince out in favor of HHH/Stephanie as well. This will lead to Vince trying to regain control of his own company, which will involve him talking about how he's changed his views and been made a believer out of Daniel Bryan and probably a promo or two about how he's defeated every nemesis he's encountered yet (the other various wrestling promoters, WCW & Ted Turner/Time Warner, the United States government, etc.) and now it's time for his own daughter and son-in-law to realize they will be no different.
It's possible though that the whole Corporate struggle for power and control of WWE is dropped and the Bryan/HHH match at Mania (assuming it doesn't take place before) is about their own personal rivalry without the other stuff involved.