Just updated my girlfriends 928 and noticed and interesting change from earlier builds (at least that I am aware). Previously you could change ONLY the internet apn, whereas now you can also change the mms apn. If this flows through to the Icon as well, it means we can actually take our SIM unlocked Icons to AT&T or T-Mobile and, at very least, get their Band 4 LTE and actually be able to send and receive MMS/Group messages.
Definitely a big change if it holds, and would allow us much more flexibility for our phones. Will test on my Icon with AT&T when it gets updated. Caution however, because I've played around with this before and been forced to hard reset afterward to get LTE back because the T-Mobile apn settings got locked in as Verizon SIM cards dont have the ability/information to override it.