Here is the updated partition lists for the various Rises and the Event. As soon as I get my Hydro in the mail, I'll add it's partition list as well.
I'm pretty certait these are accurate from comparing other devices with Qualcomm Snapdragon S2 chips. (MSM7x30 and MSM8x55)
Sprint / Virgin Mobile Rise
PHP:
mmcblk0p1 SYS_BOOT / AMSS
mmcblk0p2 DBL
mmcblk0p3 OSBL
mmcblk0p4 EXTENDED
mmcblk0p5 ABOOT
mmcblk0p6
mmcblk0p7
mmcblk0p8 BOOT
mmcblk0p9 ADSP
mmcblk0p10 MODEMST1
mmcblk0p11 MODEMST2
mmcblk0p12 SYSTEM
mmcblk0p13 CACHE
mmcblk0p14 PERSIST
mmcblk0p15 RECOVERY
mmcblk0p16 FOTA
mmcblk0p17 SYSPROP
mmcblk0p18 CARRIER
mmcblk0p19 DEVLOGS
mmcblk0p20 DATA
Public Mobile Rise
PHP:
mmcblk0p1 SYS_BOOT / AMSS
mmcblk0p2 DBL
mmcblk0p3 OSBL
mmcblk0p4 EXTENDED
mmcblk0p5 ABOOT
mmcblk0p6
mmcblk0p7
mmcblk0p8 BOOT
mmcblk0p9 ADSP
mmcblk0p10 MODEMST1
mmcblk0p11 MODEMST2
mmcblk0p12 SYSTEM
mmcblk0p13 CACHE
mmcblk0p14 PERSIST
mmcblk0p15 RECOVERY
mmcblk0p16 FOTA
mmcblk0p17 SYSPROP
mmcblk0p18 DEVLOGS
mmcblk0p19 USERDATA
Virgin Mobile Event
PHP:
mmcblk0p1 SYS_BOOT / AMSS
mmcblk0p2 DBL
mmcblk0p3 OSBL
mmcblk0p4 EXTENDED
mmcblk0p5 ABOOT
mmcblk0p6
mmcblk0p7
mmcblk0p8 BOOT
mmcblk0p9 ADSP
mmcblk0p10 MODEMST1
mmcblk0p11 MODEMST2
mmcblk0p12 SYSTEM
mmcblk0p13 CACHE
mmcblk0p14 PERSIST
mmcblk0p15 RECOVERY
mmcblk0p16 FOTA
mmcblk0p17 SYSPROP
mmcblk0p18 CARRIER
mmcblk0p19 USERDATA
mmcblk0p20 DEVLOGS
mmcblk0p21 INTERNALSD
Boost Mobile Hydro
Cricket Hydro
Edit:
I think I *might* know what 6 and 7 are for. Using this as an inaccurate guideline:
https://cooltrainer.org/2012/11/28/samsung-galaxy-s-iii-sgh-i747-complete-cm10-update-guide/
I think it's safe to say that p6/7 are fsg and backup, although I am unsure which is which.
Going by that link, this is the order of the 4 partitions listed:
PHP:
mmcblk0p12 modemst1
mmcblk0p13 modemst2
mmcblk0p20 backup
mmcblk0p21 fsg
So p6 could be backup, and p7 could be fsg.
Time for some more research!
EDIT2:
Also, I was looking at the Kyocera Developers page and noticed that they have indeed actually added the source for the Event, they just mislabeled it as the Hydro. I mean, the body has some very striking similarities, and I wouldn't be surprised in the slightest if their boards weren't much different.
"Hydro C5133 4.0.4 OS (1.005VM)"