Kevin F. Keiser has let me know about a project that he and his wife have been working on: a new, more handy edition of the Summa Theologiae in Latin and English. You can see the project at www.novantiqua.com (and also on Amazon).
The edition is mostly aimed at those who want to learn to read Aquinas' Latin, or at least want to have it ever present even if they cannot deal with it by itself. The idea for it was born from Keiser's teaching and tutoring experience, with various students asking whether such a thing existed. The first volume has appeared, covering Prima pars, qq. 1-64, and the second volume will be coming out very shortly.
Good luck with the project, Kevin.