Ormandy actually recorded the Brahms First three times for Columbia, once in 1950 (in the mono Ormandy set) and twice in stereo. As for "new remasterings," Sony apparently used the masterings that were issued by Sony Japan 10-15 years ago for those items.
I e-mailed producer Robert Russ to ask about the Eroica, and he confirmed that it will be in the second volume along with the other Beethoven symphonies. The real question concerns whether the reissue will include the exposition repeat, which was edited out of the recording in later pressings and in all reissues to date. Russ said he'd look into it. As for the Eighth and Ninth, they were released after 1963 (the Ninth was recorded in 1964), so they didn't make the cut.
Also not included in this set were the Bach items from the 1958 collection "The Beloved Choruses," with the Mormon Tabernacle Choir; Russ confirmed that these will be added to the later collection of Bach choruses in volume 2.