The Boxset itself is only a pre-order thing with AnimEigo. If you wanted the box, you should have pre-ordered. They may have a few left. Check their site.
Otherwise, those that miss out will only get the individual releases usually starting 6 months to a year later.
July for End of Evangelion, the only movie you should care about if you already have the series.
You should order any remainder box sets through AnimEigo http://www.animeigo.com
I remember hearing that they were getting the rights to some extra materials, which is why they were pushing the dates back. I assume that the extras will be on EoE and not D&R. Either way, I'm getting both movies (something about D&R intrigued me and I loved it).