From the April 23rd 2013 edition of Figure 4 Weekly Newsletter:
Since it was brought up on the radio shows this week, here is what the plan had been for Vince McMahon after he blew up in a limo several years back. None of this ever took place since shortly thereafter Chris Benoit went on his murder/suicide rampage and the entire storyline was dropped. The original idea was to be along the lines of the famous Dallas soap opera storyline of who shot JR (even though I was only six or seven at the time, I remember this vividly since I used to spend the night at Granny's house every Friday night and she'd always be watching Dallas religiously). Vince's entire family was going to return to TV in full force, including his real-life brother Rod McMahon and his family. Rod lives (or at least did at the time) in North Carolina and has pretty much zero contact with Vince. The company had actually contacted him and he'd agreed to show up for Vince's funeral, but of course that never took place, and no contact was ever made with Rod again. I can't remember who it was, but at one point someone on one of our radio shows years back when we used to have the former WWE writers on during WrestleMania weekend mentioned that Vince, while gone in storyline, would be amassing a HOBO ARMY to try to reclaim his throne upon returning. That was never the case, although there were preliminary discussions about how when Vince was gone he'd grow out his hair and beard and fingernails and basically play a Howard Hughes-style recluse character. Those ideas never got very far. In the end there was going to be a full investigation into who killed Vince, and it would be revealed that Mr. Kennedy (the now-Mr. Anderson in Aces and Eights in TNA) would reveal himself to be the illegitimate son of Vince. The long-term idea -- and keep in mind at this point there was really no such thing as long-term ideas because Vince still changed his mind on a dime -- was that there would be a number of swerves leading to a will being discovered. It would lead to a big reveal on Raw that Vince left the company to Kennedy, and the storyline would be either that Kennedy got the company or there would be a battle between Kennedy and Stephanie/Shane where whoever was the most ruthless would end up with it. This was going to play out all the way to WrestleMania 24, where Vince would make his triumphant return, side with Kennedy, and presumably it would go on from there.
Also Bruce Campbell was supposed to have a cameo appearance at McMahon's funeral. Swear to God.