I've got my new Motorola Razr Maxx (GSM version) and found that all I had to do to get internet and MMS working was setup one APN and download Sofbank's email application.
So here is my APN setting (same as I used before, no need to add another mms apn separately):
1) Add new APN in phone's settings with these values:
Proxy: <not set=""></not>
Port: <not set=""></not>
Server: <not set=""></not>
MMS proxy: mmsopen.softbank.ne.jp
MMS port: 8080
Authentication type: <not set=""></not>
APN type: default,dun,mms
APN protocol: IPv4
2) Launch Google Play and search for Softbankメール application. Once you install it, you will find the application to be as crappy as it always used to be, but at least your softbank email works. :-)
Edited by Eso Rimmer, 24 May 2012 - 02:21 PM.