Yes, he's coming back from Tekken 7!
There is no information if Craig Marduk is coming back from Tekken 7 but there is a chance that he will appear in Tekken 7.
Yes, Marshall Law is coming back from Tekken 7.
There is no information if Forest Law is coming back from Tekken 7.
no
there will not be tekken 7 however there will be a tekken tag tournament 2 and eddy gordo will be featured on it
Yes
No, he died in Tekken 6 with Wang Jinrei.
i think so because hes one of my favorite characters in tekken
there is no information but its quite possible
Yes Yoshimitsu is going to make another appearance in Tekken 7, to be honest I love Yoshimitsu and he appear in every game in the Tekken series! XD
Unknown if Heihachi Mishima is coming back from Tekken 7 because, however, the person who play Heihachi Mishima in the Tekken series name Daisuke Gori who died in January 17 2010 (aged: 57). However, it is unknown if him and the character died with him though. Or probably a new voice might replace Heihachi in Tekken 7 as well.