What I could see them doing is spacing out a theatrical 3D re-release of the OT-SE from late August / early September to late October / early November of 2015. That's one of the traditional stretches of the year for doing re-releases since there's less competition from big new movies coming out. January-March, when the '97 SE's were released, is another such window.

A September-November re-release would lead pretty perfectly into ep7 in December. They could even do marathon screenings the afternoon before.

Something I'd love to see happen, but probably won't, is a simultaneous theatrical re-release of an OOT restoration for repertory movie houses to show. The AFI Silver in Silver Spring, MD (just outside DC) is doing an Alec Guinness series this summer and it kills me that they're showing the '97 version of Star Wars instead of the genuine article.