http://www.idwpublishing.com/newreleases2.shtml - #1, June 6th
http://www.idwpublishing.com/newreleases.shtml - #2, June 13th
Mirrored here:
http://tfarchive.com/comics/idw/preview ... movieadapt
#3 and #4 will be released in the following two weeks. The comic issues contain extra interviews, art, etc. but a trade paperback is already in stores now if that's your preferred way of reading:
http://www.amazon.com/exec/obidos/ASIN/ ... nsforme-20
And of course the Movie Prequel trade is also already out with earlier story:
http://www.amazon.com/exec/obidos/ASIN/ ... nsforme-20