ok so i did a little research and tried to follow what the release grab threads were saying about vs. gw.
basically what happens is if the character marth is grabbing is off of the ground during the grab stand animation (marth just holding gw, gw is not touching the ground), then no matter what gw will do a jump release assuming marth isn't grab attacking gw. So marth just needs to grab, and when gw escapes the grab, he will do the jump release.
Now, supposedly there is a certain amount of time before gw can react, and marth can land some attacks w/o fail. Assuming the testing they have done is correct, then a fair, dolphin slash, and dancing blade are all free hits.
What does this mean for gw players? well besides the obvious don't get grabbed, make sure your always mashing out of your grabs, as they will probably try to get a few grab hits in and then wait, you'd rather avoid that damage. Other than that, keep looking for ways to get out of these hits. Maybe their testing isn't 100% correct just yet. If they are right then we'll just have to live with the fact that getting grabbed at 130% will mean that gw will die.
If marth could get free fsmash tippers out of this, i would say it would make a huge impact on the matchup, as he could kill MUCH earlier, but since fair isn't as strong it isn't as big of a deal. I still say this matchup is even, does anyone else have any information on this subject?