Just a quick update, a friend on Blu-Ray.com translated the specs for the upcoming Toho Blu-Rays from this site:
www.toho-a-park.com

The specs for Rodan are:
Features:
1. Theatrical Preview (HD Blow-Up Quality)
2. "Mach-Speed Monster Rodan" 8mm (SD quality)
3. Toho Monster Picture Book 1 "Mach-Speed Monster Rodan" (still images + narration / HD quality)
4. "Location Hunting Rodan" (tentative) (HD quality) [NEW FEATURE!]
5. Audio Commentary (Sadamasa Arikawa)

Audio:
1. Mono (Linear PCM)
2. BGM (music only) Mono (Linear PCM)
3. ME (music + sound FX) Mono (Linear PCM)
4. Audio Commentary (Dolby Digital)

Subtitles:
1. Japanese