howling thanks. With that information i was able to re-create this without too much trouble. I was also able to take it further and make it something that is usable in match, but its pretty situational. basically they need to be in or near the corner and you have to hit them while they are in the air with a fireball. I have been in this specific scenario many times, im sure most of you have. well after you hit them with the fireball you palm them but you need to make sure they are kind of high when the palm hits, you then fadc out of palm and immediately do lk tatsu. the initial tatsu hit wiffs, but the second and if their height is correct the last hit connects as well. EX tatsu seems to hit one time and throw them out of the corner. from what i see it looks like palm puts the opponent in the same state as j.mp puts them in, where you can only do a select number of things after the the move connects. which in the case of palm seems to be the same stuff you can do after you connect the 2 hits from j.mp minus doing another j.mp. however, i would put money on that if they were high enough you could connect j.mp for 1 hit after palm.
so basically, this is not terribly useful, but if its going to kill them why not do it? sure if you have ultra/super you can do that instead for bigger damage but if those options are not available you have this.
EDIT: i take that back, j.mp WILL connect cause i just did it.