The following information has been released publicly by VZW advanced support so I feel I can share this now:
If you want to use the UML290 on the Mac/Linux/UNIX/other-platforms you can now do so if you have the engineering knowledge or a little know-how:
Quick Notes: Verizon 4G LTE uses the GSM APN authentication method through a GGSN (similar to AT&T) and 3G (1X/EVDO) traditional uses the HA CDMA method. The old CDMA authentication method has been posted years before so I won't repost that.
You WILL NOT GET SUPPORT UNTIL THE OFFICIAL VZACCESS Software comes out on the Mac.
So on the Mac connection manager (generic apple), make a profile for your UML290 hardware, should be a modem. Make a GSM connection profile with the above. Phone number is your data-stick phone number (fake phone number, used for system identification, get it from VZAccess or your account page online). Account name is "email@example.com". (Basically add @vzw4g.com to your phonenumber. Password is "vzw", same as 3g CDMA. In GSM/3G/4G carrier use generic (no special parameters). Model is GPRS (GSM/3G, same as 4G). GSM APN is "vzwinternet". CID is 1 if your drivers need it.
Enjoy 4G LTE GSM technology by VZW on your Mac! I will be running this on my Linux engineering dev machine soon.
I think a lot of this felling that people have that they are entitled to keep their unlimited data plan stems from the carriers originally forcing people to keep whatever plan they originally signed...