I made this exact point previously. Both the xxxD series and the xxD series have 9-pt AF systems, but there's a significant difference between them in terms of performance (1 vs. 9 cross-type points, no dual-cross f/2.8 center point on the xxxD, etc.).
Just stating that the new 5D will have 61-pt AF says very little about it's expected performance characteristics. Giving it a 'dumbed down' version of the 1D X makes sense from a marketing standpoint, as it may mislead buyers into thinking they're getting the same AF as in the 1D X, when they're getting a much less capable system.
I just hope that it's the real 1DX AF with just a minor tweak down that most won't care about too much. But I do fear what you suggest.
They have no video exclusive or high MP count exclusive to fall back on this time so one would hope marketing was not quite so dumb to think they can still cripple the fps and AF and somehow not look foolish.
I do get back to the statement buy that guy who has already held the 5D3 who said that some might still prefer a 1Ds3,1D3,1D4,1Ds2,1D2 even in some ways (I wonder if by that he meant that this 61pt AF actually is just some dumbed down Rebel-level performance AF sensor/logic with a bunch of poorly performing points added on and still mediocre AI Servo tracking speed....).
Anyway we will see.
I hope Canon looks closely that the D800 and reconsiders delaying the 5D3 until next Fall if they actually have crippled it too much. With the D800 supposedly having top quality video, great DR, Nikon's best AF I mean a 22MP and crippled dumbed down 5D3 for $3500.... yikes.