I don't think that all the participants for the WWE title one have been named yet. I expect Rey Mysterio to be added to it for sure, so that they don't have to rely heavy on Jericho to do all the high spots. I also see The Miz perhaps added to make it an even 6.
As for the WHC one, while I'm not surprised to see Tensai in the match (they always have one big guy in there) I am surprised that they have denied Gabriel the chance to be in the match (given that Tensai beat him to qualify). While Gabriel would never have won it, he has been in 2 MITB matches (I think, or is it one?) and had good showings.
I expect that the final 6th spot is for Wade Barrett. They're just waiting to see if he'll be ready in time IMO. If he's not, then perhaps we'll see Rhodes in there perhaps?
I don't think Sin Cara will be in, since it seems he's starting a feud with Cesaro. So IMO, if Barrett isn't ready to return, Rhodes will get the final spot.