It looks like Google Books is going to be the new first place for previews on this series at the rate we are going, but they are doing it in a much more random way than their iTunes counterpart usually does. We have 7 preview pages for the upcoming 20th installment of the main series My Little Pony comics, but they are from all over the place in the actual book. If you want to avoid spoilers completely, it may be wise to avoid clicking past the break to check them out.
Thanks to Masem for sending it in!
(Note for those that didn't read above: These are from all over the book in a random order! Read at your own risk!)