I didn't get an email, but I do think it's pretty cool that many that did get the email appeared to put a lot of time into previous games in the series...
Sure, not every person that platinum'd those games got invited, but it does appear to be based on some people with experience with the past games...
It keeps people who aren't familiar to the series from shiting up message boards with complaints of it being too hard or the mechanics aren't user friendly....
I mean they can't invite everyone, but at least those they did, appear to enjoy the series and put a lot of time into it, and that I think is a neat little reward...
And there are those that didn't play previous titles, but it looks like many did.